R- may represent:
*a type of
chirality
Chirality () is a property of asymmetry important in several branches of science. The word ''chirality'' is derived from the Greek (''kheir''), "hand", a familiar chiral object.
An object or a system is ''chiral'' if it is distinguishable fro ...
, in chemical notation
*an ''R'' prefix used for
various constants
*the set of negative
real numbers
In mathematics, a real number is a number that can be used to measurement, measure a continuous variable, continuous one-dimensional quantity such as a time, duration or temperature. Here, ''continuous'' means that pairs of values can have arbi ...
*
negative reinforcement
In behavioral psychology, reinforcement refers to consequences that increase the likelihood of an organism's future behavior, typically in the presence of a particular '' antecedent stimulus''. For example, a rat can be trained to push a lever ...
, in behavioural psychology
*membership of the United States
Republican Party, when placed before a state abbreviation, usually in parentheses after the name of a politician
{{Disambiguation