R

I

See:

r I

II UK [ɑː(r)] / US [ɑr] abbreviation

1) are: used in emails and text messages

RU free 2nite (= Are you free tonight?)

2) American restricted: used in the US for saying that people under the age of 17 cannot go to a particular film unless they go with an adult

III UK / US abbreviation

1) king or queen: used after the name of the British King or Queen on official signs or documents

Elizabeth R

2) American Republican

3) River: used especially on maps