(military) Initialism of radiotelephone operator. / (data recovery) Initialism of recovery time objective. / Initialism of road traffic officer. / Initialism of retransmission timeout.

(biblical) Abbreviation of Ruth.

Initialism of ready-to-drink.

Initialism of real-time detection. / Initialism of research and technological development. / (nanoelectronics) Initialism of resonant-tunneling diode.

(Internet) Initialism of read the fucking article. / (military) Initialism of ready team fire assist.

(computing) Initialism of Real Time Messaging Protocol. / (computing) Initialism of Routing Table Maintenance Protocol. / Initialism of Royal Tyrrell Museum of Palaeontology.

(Internet) Initialism of read the fucking FAQ.

(space flight) Initialism of return to launch site.

Initialism of radioisotope thermoelectric generator (a device that generates electricity from the natural decay of radioactive material). / (aviation) Abbreviation of radiotelegraph.

Initialism of Radeon Technology Group (a division of Advanced Micro Devices (AMD), who produces a brand of computer products). / Initialism of Radio Télévision Guinéenne (a public broadcaster in Guinea).