R.R.

See also: rr, RR, R-R, and R&R

English

Noun

R.R.

1. Alternative form of RR.

Usage notes

• This is the customary abbreviation for railroad as used in American case citations. See, e.g., The Bluebook: A Uniform System of Citation, Nineteenth Edition (2010), "Case Names and Institutional Authors in Citations", Table T6, p. 430–431.

Latin

Adjective

R.R.

1. alternative form of RR