(US) Initialism of railroad. / (cycling) Initialism of road race. / Initialism of Rolls-Royce. / Initialism of reverse racism. / Initialism of real reality.

Abbreviation of Roraima, a state of Brazil.

(aviation, travel, dated) (from the status code used in the GDS) reconfirm / reconfirmed.

plural of RR

plural of V. R.

(Canada) Registered Retirement Savings Plan—a program regulated by the federal government of Canada, offering tax advantages to help Canadian residents accumulate financial wealth, through a wide range of investment instruments, in order to provide financial security and income during retirement.

plural of RRSP

(astronomy) Initialism of rotating radio transient: a type of pulsar

plural of RRAT

(American spelling) flowing.