r1
/ɑː
/abbreviation
1Recto.
2(Giving position or direction) right: l to r: Evan, Nic, and David
3 Law Rule: under r 7.4 (6) the court may hear an application immediately
symbol
1Radius: 2πr
2 Statistics Correlation coefficient: sigmoidoscopic and symptom scores also showed a significant correlation with each other (r = 0.91)
R2
/ɑː/(also r)
noun (plural Rs or R's)
1The eighteenth letter of the alphabet.
1.1Denoting the next after Q in a set of items, categories, etc.
Phrases
the R months
the three Rs
R3
/ɑː/abbreviation
1Rand: a farm worth nearly R1,3 million
2(In names of sports clubs) Rangers or Rovers: Berwick R Featherstone R
3Réaumur (a temperature scale, now obsolete): 198.6 °R
4Regina or Rex: Elizabeth R
5 (also ®) Registered as a trademark.
6(In the US) Republican.
7North American (In film classification) restricted (denoting films restricted to viewers over a certain age).
8(On a gear shift) reverse.
9 (R.) River (chiefly on maps).
10Roentgen(s).
11Romania (international vehicle registration).
12Rook (in recording moves in chess): 21.Rh4
13 Cricket (On scorecards) run(s).
symbol
1 Chemistry An unspecified alkyl or other organic radical or group.
Abbreviation of radical
2Electrical resistance.
3 Chemistry The gas constant.