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 from ...
, 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 measure a ''continuous'' one-dimensional quantity such as a distance, duration or temperature. Here, ''continuous'' means that values can have arbitrarily small variations. Every real ...
*
negative reinforcement, in behavioural psychology
*membership of the United States
Republican Party
Republican Party is a name used by many political parties around the world, though the term most commonly refers to the United States' Republican Party.
Republican Party may also refer to:
Africa
*Republican Party (Liberia)
* Republican Part ...
, when placed before a state abbreviation, usually in parenthesis after the name of a politician
{{Disambiguation