ROM Read-only memory. RSAIT Radiation Safety Audit and Inspection Team. SAC Seintillation Alpha Counter. SATCOM Satellite Communication. SitRep Situation Report. SN Serial Number. SOP Standard (or Standing) Operating Procedure. Sr Strontium. Specifically, the isotopes 85gr and 99Sp, TG Task Group. Tl Thallium. TRU The transuranic elements. Specifically, 238py, 239pu, 240 py and 24lam. TWX Teletype message. TTPI Trust Territory of the Pacific Islands. Uranium. Specifically the isotopes 234y, 235y and 238u, UPS Uninterruptible Power Supply. USAF United States Air Force. Yttrium. Specifically the isotope 90y, mu - Greek alphabet letter used to denote attenuation; also micro rho - Greek alphabet letter used to denote density. (1078)