3166 trigram) RF Rf – (s) Rutherfordium RF – (i) Radio Frequency – Receptive Field (neurophysiology) RFA – (i) Restrictive Fire Area (military) – Royal Field Artillery RFC – (i) Request for Comments – Royal Flying Corps (WWI precursor to RAF) RFD – (a) Request for Documentation RFE – (i) Request for Evaluation RFEF – (i) Real Federación Española de Fútbol (Spanish for Royal Spanish Football Federation) RFF – (i) Right of First Refusal (legal term) RFI – (i) Ready For Inspection – Ready For Issue – Request For Information – Radio Frequency Interference RFID – (p) Radio Frequency IDentification RFL – (i) Rugby Football League RFL – (i) Restrictive Fire Line (military) RFP – (a) Request for Proposal RFQ – (a) Request for Quotation RFT – (a) Request for Tender RFU – (i) Rugby Football Union RG Rg – (s) Roentgenium RG – (i) Republican Guard RGB – (i) Red Green Blue (colour model) RGBI – (i) Red Green Blue Intensity (ditto) RH Rh – (s) Rhodium RH – (s) Southern Rhodesia (ISO 3166 digram; obsolete 1980) RHIC – (i) Relativistic Heavy Ion Collider RHLI – (i) Royal Hamilton Light Infantry (Canadian militia regiment) RHO – (s) Southern Rhodesia (ISO 3166 trigram; obsolete 1980) RHS – (i) Right Hand Side – Redland High School – (a) Royal Horticultural Society – London RHU – (i) Replacement Holding Unit RHWR – (i) Radar Homing and Warning Receiver ("raw" for short) RI RI – (s) Rex et Imperator, Regina et Imperatrix King-Emperor RI – (s) Rhode Island (postal symbol) RIAA – (i) Recording Industry Association of America RIBA – (a) Royal Institute of British Architects RIF (i) Reduction In Force (layoffs) Resistance Index for Frostbite Reading Is Fundamental RIFA – (a) Red imported fire ant RILA – (a) Retail Industry Leaders Association RIM (a) Remote integrated multiplexer, Australian term for a digital loop carrier Research In Motion, former name of the BlackBerry company Revolutionary Internationalist Movement (Maoist organization) Royal Indian Marine, former navy of British colonial India RIMVS – (i) Retinal Imaging Machine Vision System RINO – (a) Republican In Name Only RIP (a/i) Relief In Place (i) requiesca[n]t in pace (Latin for "may he/she/they rest in peace") RIS (i) Range Instrumentation System Réseau Info Sports (French, roughly "Sports News Network" — Canadian French-language TV channel) RISC – (i) Reduced Instruction Set Computer RISD – (p) Rhode Island School of Design ("riz-dee")