RF is an abbreviation for

radio frequency Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around to around . This is roughly between the uppe ...

. Rf or RF may also mean:

Arts and entertainment

* ''

Red Faction (series) ''Red Faction'' is a series of shooter video games developed by Volition and owned by Koch Media. Originating in 2001, the ''Red Faction'' games have spanned Microsoft Windows, macOS and consoles, including the PlayStation 2, GameCube, Xb ...

'', a series of revolution video games * Rinforzando, , in music notation * ''

RF Online ''RF Online'', originally named 'Rising Force', ( ko, 라이징 포스) is a 3D MMORPG developed by CCR. The first version of the game was released in South Korea and was later followed by Chinese (Mandarin), Japanese, Indonesian, Portuguese an ...

'', an online RPG made by CCR

Businesses

* Aero K, IATA code (2020—present) * Florida West International Airways, IATA code (1984—2017) * Regions Financial Corporation, NYSE stock symbol

Government and military

France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of overseas regions and territories in the Americas and the Atlantic, Pacific and Indian Oceans. Its metropolitan ar ...

(''République française'') *

Russian Federation Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia North Asia or Northern Asia, also referred to as Siberia, is the northern region of Asia, which is defined in geographic ...

Rhodesian Front The Rhodesian Front was a right-wing conservative political party in Southern Rhodesia, subsequently known as Rhodesia. It was the last ruling party of Southern Rhodesia prior to that country's unilateral declaration of independence, and the ru ...

, former political party in Rhodesia

Biology and medicine

Rheumatic fever Rheumatic fever (RF) is an inflammation#Disorders, inflammatory disease that can involve the heart, joints, skin, and brain. The disease typically develops two to four weeks after a Streptococcal pharyngitis, streptococcal throat infection. Sign ...

, an inflammatory disease *

Release factor A release factor is a protein that allows for the termination of translation by recognizing the termination codon or stop codon in an mRNA sequence. They are named so because they release new peptides from the ribosome. Background During t ...

s RF1, RF2, RF3, proteins *

Reticular formation The reticular formation is a set of interconnected nuclei that are located throughout the brainstem. It is not anatomically well defined, because it includes neurons located in different parts of the brain. The neurons of the reticular formation ...

, in the brainstem *

Rheumatoid factor Rheumatoid factor (RF) is the autoantibody that was first found in rheumatoid arthritis. It is defined as an antibody against the Fc portion of IgG and different RFs can recognize different parts of the IgG-Fc. RF and IgG join to form immune com ...

, an antibody *

Receptive field The receptive field, or sensory space, is a delimited medium where some physiological stimuli can evoke a sensory neuronal response in specific organisms. Complexity of the receptive field ranges from the unidimensional chemical structure of odo ...

, the response characteristic of a neuron *

Respiratory failure Respiratory failure results from inadequate gas exchange by the respiratory system, meaning that the arterial oxygen, carbon dioxide, or both cannot be kept at normal levels. A drop in the oxygen carried in the blood is known as hypoxemia; a rise ...

Risk factor In epidemiology, a risk factor or determinant is a variable associated with an increased risk of disease or infection. Due to a lack of harmonization across disciplines, determinant, in its more widely accepted scientific meaning, is often us ...

Other uses in science and technology

Representative fraction Spatial scale is a specific application of the term scale for describing or categorizing (e.g. into orders of magnitude) the size of a space (hence ''spatial''), or the extent of it at which a phenomenon or process occurs. For instance, in phys ...

Retardation factor In chromatography, the retardation factor (''R'') is the fraction of an analyte in the mobile phase of a chromatographic system. In planar chromatography in particular, the retardation factor ''R''F is defined as the ratio of the distance traveled ...

in a chromatographic system *

Radiative forcing Radiative forcing (or climate forcing) is the change in energy flux in the atmosphere caused by natural or anthropogenic factors of climate change as measured by watts / metre2. It is a scientific concept used to quantify and compare the exter ...

, the change in energy flux in the atmosphere caused by climate change factors *

Random forest Random forests or random decision forests is an ensemble learning method for classification, regression and other tasks that operates by constructing a multitude of decision trees at training time. For classification tasks, the output of th ...

, an ensemble learning method in data science *

Rutherfordium Rutherfordium is a chemical element with the symbol Rf and atomic number 104, named after New Zealand-born British physicist Ernest Rutherford. As a synthetic element, it is not found in nature and can only be made in a laboratory. It is radioacti ...

, symbol Rf, a chemical element *

Canon RF mount The Canon RF lens mount is an interchangeable- lens mount developed by Canon for its full-frame mirrorless interchangeable-lens cameras, and featured first by the EOS R, followed by the EOS RP. The RF mount was announced in September 2018. I ...

Sports

* Range Factor, a baseball statistic *

Right fielder A right fielder, abbreviated RF, is the outfielder in baseball or softball who plays defense in right field. Right field is the area of the outfield to the right of a person standing at home plate and facing towards the pitcher's mound. In t ...

, a defensive position in baseball *

Swedish Sports Confederation The Swedish Sports Confederation ( sv, Riksidrottsförbundet, RF) is the umbrella organisation of the Swedish sports movement. Through its member organisations, it has three million members in 22,000 clubs. The Confederation was formed on 31 May 1 ...

( sv, link=no, Riksidrottsförbundet, RF), the umbrella organisation for Swedish sports

Other uses

* Registered association (Finland), legal status *

Royalty-free Royalty-free (RF) material subject to copyright or other intellectual property rights may be used without the need to pay royalties or license fees for each use, per each copy or volume sold or some time period of use or sales. Computer standard ...

, in business {{disambiguation