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Surface Bar
Barbell style piercing jewelry is composed of a straight bar with a bead on each end, one or both beads unscrewable for removal and/or changing of the beads. Often one of the beads is fixed, either via epoxy or welding, so that only one bead is used to install or remove the jewelry. Barbell threads are usually right-handed. They are named because they resemble the barbells that are used in weightlifting. Types of barbells Internally threaded barbells Named because the bar has smooth ends with receiving threads tapped into the end of the bar. In internally threaded jewelry, the bead has a receiving tube machined into it (this is referred to as "countersunk"), with a threaded post extending from the center, which mates with the threaded receiving tube on the bar. Being much less likely to cause damage and irritation, especially at the time of piercing, internally threaded jewelry is considered superior to externally threaded jewelry. It is usually slightly more expen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tragus Piercing
A tragus piercing is the perforation of the tragus, which projects immediately in front of the ear canal, for the purpose of inserting and wearing a piece of jewelry. The piercing itself is usually made with a small gauge hollow piercing needle, and typical jewelry would be a small diameter captive bead ring or small gauge post style piercing jewelry. A related piercing is known as the antitragus piercing. History The tragus piercing has no ties to any ancient culture and was first established around the time of the rook and daith piercings in the 1980's. The name comes from the medical term of the flap of skin that is pierced. The popularity of tragus piercings began to increase around 2005, according to a BBC report. Jewelry Barbells A barbell is a piece of exercise equipment used in weight training, bodybuilding, weightlifting, powerlifting and strongman, consisting of a long bar, usually with weights attached at each end. Barbells range in length from to above , a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tongue Piercing
A tongue piercing is a body piercing usually done directly through the center of the tongue. Since its decline in popularity around 2011, it has seen a recent upsurge making it now the second most popular piercing amongst young women aged 18–25 in 2019. It has become quite unpopular amongst men, although in the 1990s and early 2000s, it was more popular for men than women to get and associated with punk culture. Midline tongue piercings, or one hole through the center of the tongue is the most common way to have the tongue pierced. History and culture The term "tongue ring" is often used to refer to tongue piercing, but this is not accurate as rings are rarely worn in tongue piercings. There is a history of ritual tongue piercing in Aztec and Maya cultures. Priests would pierce their tongues and either draw blood from them or pass rough cords through to inflict pain. However, there is no evidence that the Aztecs practiced long-term or permanent tongue piercing, despite the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Disk (mathematics)
In geometry, a disk (Spelling of disc, also spelled disc) is the region in a plane (geometry), plane bounded by a circle. A disk is said to be ''closed'' if it contains the circle that constitutes its boundary, and ''open'' if it does not. For a radius r, an open disk is usually denoted as D_r, and a closed disk is \overline. However in the field of topology the closed disk is usually denoted as D^2, while the open disk is \operatorname D^2. Formulas In Cartesian coordinates, the ''open disk'' with center (a, b) and radius ''R'' is given by the formula D = \, while the ''closed disk'' with the same center and radius is given by \overline = \. The area (geometry), area of a closed or open disk of radius ''R'' is π''R''2 (see area of a disk). Properties The disk has circular symmetry. The open disk and the closed disk are not topologically equivalent (that is, they are not homeomorphism, homeomorphic), as they have different topological properties from each other. For ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cone (geometry)
In geometry, a cone is a three-dimensional figure that tapers smoothly from a flat base (typically a circle) to a point not contained in the base, called the '' apex'' or '' vertex''. A cone is formed by a set of line segments, half-lines, or lines connecting a common point, the apex, to all of the points on a base. In the case of line segments, the cone does not extend beyond the base, while in the case of half-lines, it extends infinitely far. In the case of lines, the cone extends infinitely far in both directions from the apex, in which case it is sometimes called a ''double cone''. Each of the two halves of a double cone split at the apex is called a ''nappe''. Depending on the author, the base may be restricted to a circle, any one-dimensional quadratic form in the plane, any closed one-dimensional figure, or any of the above plus all the enclosed points. If the enclosed points are included in the base, the cone is a solid object; otherwise it is an open surface ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylinder (geometry)
A cylinder () has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base. A cylinder may also be defined as an infinite curvilinear surface in various modern branches of geometry and topology. The shift in the basic meaning—solid versus surface (as in a solid ball versus sphere surface)—has created some ambiguity with terminology. The two concepts may be distinguished by referring to solid cylinders and cylindrical surfaces. In the literature the unadorned term "cylinder" could refer to either of these or to an even more specialized object, the '' right circular cylinder''. Types The definitions and results in this section are taken from the 1913 text ''Plane and Solid Geometry'' by George A. Wentworth and David Eugene Smith . A ' is a surface consisting of all the points on all the lines which are parallel to a given line and which pass through ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triangle
A triangle is a polygon with three corners and three sides, one of the basic shapes in geometry. The corners, also called ''vertices'', are zero-dimensional points while the sides connecting them, also called ''edges'', are one-dimensional line segments. A triangle has three internal angles, each one bounded by a pair of adjacent edges; the sum of angles of a triangle always equals a straight angle (180 degrees or π radians). The triangle is a plane figure and its interior is a planar region. Sometimes an arbitrary edge is chosen to be the ''base'', in which case the opposite vertex is called the ''apex''; the shortest segment between the base and apex is the ''height''. The area of a triangle equals one-half the product of height and base length. In Euclidean geometry, any two points determine a unique line segment situated within a unique straight line, and any three points that do not all lie on the same straight line determine a unique triangle situated w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cube
A cube or regular hexahedron is a three-dimensional space, three-dimensional solid object in geometry, which is bounded by six congruent square (geometry), square faces, a type of polyhedron. It has twelve congruent edges and eight vertices. It is a type of parallelepiped, with pairs of parallel opposite faces, and more specifically a rhombohedron, with congruent edges, and a rectangular cuboid, with right angles between pairs of intersecting faces and pairs of intersecting edges. It is an example of many classes of polyhedra: Platonic solid, regular polyhedron, parallelohedron, zonohedron, and plesiohedron. The dual polyhedron of a cube is the regular octahedron. The cube can be represented in many ways, one of which is the graph known as the cubical graph. It can be constructed by using the Cartesian product of graphs. The cube is the three-dimensional hypercube, a family of polytopes also including the two-dimensional square and four-dimensional tesseract. A cube with 1, unit s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spherical
A sphere (from Ancient Greek, Greek , ) is a surface (mathematics), surface analogous to the circle, a curve. In solid geometry, a sphere is the Locus (mathematics), set of points that are all at the same distance from a given point in three-dimensional space.. That given point is the center (geometry), ''center'' of the sphere, and the distance is the sphere's ''radius''. The earliest known mentions of spheres appear in the work of the Greek mathematics, ancient Greek mathematicians. The sphere is a fundamental surface in many fields of mathematics. Spheres and nearly-spherical shapes also appear in nature and industry. Bubble (physics), Bubbles such as soap bubbles take a spherical shape in equilibrium. The Earth is spherical Earth, often approximated as a sphere in geography, and the celestial sphere is an important concept in astronomy. Manufactured items including pressure vessels and most curved mirrors and lenses are based on spheres. Spheres rolling, roll smoothly in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piercing Migration
Piercing migration is a body piercing's movement from its initial location. Migration may be unnoticed, or painful with progression. It may be slight and brief, or continue until exiting the skin. Potential causes and effects of migration Migration varies widely. The most common case is heavy, small gauge earrings moving down until exiting the earlobe after most of a lifetime. It is dubbed the "cheese-cutter effect", because of its similarity to cutting cheese using a fine wire. Contemporary body and ear piercing jewelry mitigates the effect by increasing the weight to gauge ratio. However, migration remains possible, especially with heavy jewelry, even of large gauge. Another migration cause, though rare, is play or movement affecting the pierced or implanted area, either by causing a wound, or merely stretching the fistula in one direction, thus allowing tissue growth in the void behind. The latter can affect tongue piercings, for example, but neither normally induces exit fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Staple (fastener)
A staple is a type of two-pronged fastener, usually metal, used for joining, gathering, or binding materials together. Large staples might be used with a hammer or staple gun for masonry, Roofing material, roofing, corrugated boxes and other heavy-duty uses. Smaller staples are used with a stapler to attach pieces of paper together; such staples are a more permanent and durable fastener for paper documents than the paper clip. Etymology The word "staple" originated in the late thirteenth Century, from Old English ''stapol'', meaning "post, pillar". The word's first usage in the paper-fastening sense is attested from 1895. History In ancient times, the staple had several different functions. Large metal staples dating from the 6th century BC have been found in the masonry works of the Persian empire (ancient Iran). For the construction of the Pasargadae and later Ka'ba-ye Zartosht, these staples, which are known as "dovetail" or "swallowtail" staples, were used for tightenin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surface Piercing
Surface piercings are Body piercing, piercings that are found on flat parts of the body, giving a double-pierced look that sits flat against the skin. A surface bar follows the plane of skin, while a standard piercing is pierced through the plane. Standard piercings have an entrance hole with an exit hole that is usually directly behind the entrance hole, whereas with a surface piercing the entrance and exit holes are next to each other on the skin surface. Types Some examples of surface piercings: *Corset piercing: a series of bilaterally symmetrical piercings, normally done on the back, intended to be laced like a corset. *Christina piercing: located at the mons pubis. *Madison piercing: a horizontal piercing located just above the collarbone, at the base of the neck. *Nape piercing: located on the back of the neck. *Neck piercing: located on the side of the neck. It is also called "Vampire Bites". *Hip piercing: located on or beside the hips (on the pelvis near the hips bones). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
