R

Ⅰ.

R [1] (also r) ► NOUN (pl. Rs or R's) ▪ the eighteenth letter of the alphabet.

● the three Rs — Cf. ↑the three Rs

Ⅱ.

R [2] ► ABBREVIATION 1) rand. 2) Regina or Rex. 3) (®) registered as a trademark. 4) (R.) River. 5) roentgen(s). 6) rook (in chess). 7) Cricket (on scorecards) run(s).