RR

• R.R. (esp. in legal reference to railroads)

RR (countable and uncountable, plural RRs)

1. (US) Initialism of railroad.
2. (cycling) Initialism of road race.
3. Abbreviation of rear, where brevity is desired.
4. Initialism of right rear, a location in a square or rectangular layout such as the tires on an automobile or the heating elements on a stovetop.
5. Initialism of Rolls-Royce.
6. Initialism of reverse racism.
7. Initialism of real reality.
8. (statistics, epidemiology) Initialism of relative risk.
9. (US) Initialism of rural route used when addressing mail.
10. Initialism of Riva-Roccin, a blood pressure measurer device
11. Initialism of role reversal.
12. (information technology) Initialism of resource record.

(real reality):

• AR (augmented reality)
• VR (virtual reality)

RR

1. Abbreviation of Roraima, a state of Brazil.

RR

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

• R and R

• R.R., RR., R. R.

RR

1. Abbreviation of rerum, of things, of topics.

RR (singular R)

1. Abbreviation of reverendissimi, most holy, most reverend.
2. Abbreviation of reverendissimos.
3. Abbreviation of reverendissimibus.

• RR PP

RR

1. Abbreviation of Roraima (Brazilian state)