Headless may refer to:

Science and technology

Medicine

* Acephalic acardia, a type of

twin reversed arterial perfusion Twin reversed arterial perfusion sequence, also called TRAP sequence, TRAPS, or acardiac twinning, is a rare complication of monochorionic twin pregnancies. It is a severe variant of twin-to-twin transfusion syndrome (TTTS). In addition to the twi ...

in which one twin is born without a head *

Acrania Acrania is a rare congenital disorder that occurs in the human fetus in which the flat bones in the cranial vault are either completely or partially absent. The cerebral hemispheres develop completely but abnormally. The condition is frequentl ...

, missing cranial bones *

Anencephaly Anencephaly is the absence of a major portion of the brain, skull, and scalp that occurs during embryonic development. It is a cephalic disorder that results from a neural tube defect that occurs when the rostral (head) end of the neural tube ...

, absence of a major part of the brain and skull *

Decapitation Decapitation is the total separation of the head from the body. Such an injury is invariably fatal to humans and all vertebrate animals, since it deprives the brain of oxygenated blood by way of severing through the jugular vein and common c ...

, the severing of the whole head from the body

Computing

In computing and software, headless can either refer to software or servers without a graphical interface, or software platforms that decouple front- and back-end components. *

Headless computer A headless computer is a computer system or device that has been configured to operate without a monitor (the missing "head"), keyboard, and mouse. A headless system is typically controlled over a network connection, although some headless system ...

, a server with no monitor, keyboard, or mouse attached *

Headless software Headless software (e.g. "headless Linux",) is software capable of working on a device without a graphical user interface. Such software receives inputs and provides output through other interfaces like network or serial port and is common on serv ...

, software capable of working on a device without a

graphical user interface A graphical user interface, or GUI, is a form of user interface that allows user (computing), users to human–computer interaction, interact with electronic devices through Graphics, graphical icon (computing), icons and visual indicators such ...

Headless browser A headless browser is a web browser without a graphical user interface. Headless browsers provide automated control of a web page in an environment similar to popular web browsers, but they are executed via a command-line interface or using netw ...

, a web browser without a graphical user interface *

Headless CMS A headless content management system, or headless CMS, is a back end-only web content management system that acts primarily as a content repository. A headless CMS makes content accessible via an API for display on any device, without a built-in ...

, a backend-only content management system that employs APIs to display content

Linguistics

* Headless phrase, a term in linguistics for a phrase with no

head A head is the part of an organism which usually includes the ears, brain, forehead, cheeks, chin, eyes, nose, and mouth, each of which aid in various sensory functions such as sight, hearing, smell, and taste. Some very simple ani ...

Geology

* Headless Formation, a geologic formation in Northwest Territories

Arts and entertainment

* ''Headless'' (TV series) a British television series starring Patrick Robinson and

Ginny Holder Ginny Holder is an actress best known for playing Thandie Abebe-Griffin on the BBC medical drama series ''Holby City''. In 1999 she played in '' Wing Commander.'' Holder appeared in various British TV series, including ''The Bill ''The Bi ...

* Headless, a foe in ''

Ultima Ultima may refer to: Places * Ultima, Victoria, a town in Australia * Pangaea Ultima, a supercontinent to occur in the future * ''Ultima'', the larger lobe of the trans-Neptunian object 486958 Arrokoth, nicknamed ''Ultima Thule'' Companies and ...

'' * Headless, NPCs in ''

The Matrix Online ''The Matrix Online'' (abbreviated as ''MxO'') is a discontinued massively multiplayer online role-playing game (MMORPG) initially developed by Monolith Productions and later, a few months after launch, by Sony Online Entertainment. It was adve ...

'' * ''Headless'' (film), a 2015 horror film by Arthur Cullipher *

Headless (band) Headless is an Italian hard rock band, founded in 1996 in Avezzano by Walter Cianciusi. Their music is characterized by the fusion of AOR and progressive metal. After having released an E.P. and a full-length album in 2000 the band suspended an ...

, an Italian hard rock band *

Mike the Headless Chicken Mike the Headless Chicken (April 20, 1945March 17, 1947) was a male Wyandotte chicken that lived for 18 months after he was beheaded, surviving because most of his brain stem remained intact and it did not bleed to death due to a blood clot. ...

(non-fiction), a Wyandotte chicken that lived for 18 months after his head had been cut off * "Headless", a song by Joe Satriani from his album ''

Flying in a Blue Dream ''Flying in a Blue Dream'' is the third studio album by guitarist Joe Satriani, released on October 30, 1989 through Relativity Records. It is one of Satriani's most popular albums and his second highest-charting release to date, reaching No. 23 ...

'' * "Headless", a song by Hella from the album ''Tripper'' * '' Stree 2: Sarkate Ka Aatank'' (), a 2024 Indian film

Literature and myths

Headless line An acephalous or headless line is a variety of catalectic line in a poem which does not conform to its accepted metre, due to the first syllable's omission. Acephalous lines are usually deliberate variations in scansion, but this is not always obvio ...

, a form of catalexis omitting an initial syllable *

Headless men Various species of mythical headless men were rumoured, in Ancient history, antiquity and later, to inhabit remote parts of the world. They are variously known as ''akephaloi'' (Koine Greek, Greek ἀκέφαλοι 'headless ones') or Blemmyes (; ...

, a mythical headless humanoid creature *

Headless Horseman (disambiguation) The Headless Horseman is a fictional character that appears in many venues. Headless Horseman may also refer to: * Headless Horseman ("Legend of Sleepy Hollow"), a character in the 1820 short story "The Legend of Sleepy Hollow" by Washington Irvi ...

{{disambiguation *

Headless Horseman The Headless Horseman is an archetype of mythical figure that has appeared in folklore around Europe since the Middle Ages. The figures are traditionally depicted as riders on horseback who are missing their heads. These myths have since inspired ...