What does SR. stand for?

What does SR. mean?

SR	A Source Round Miscellaneous » Unclassified
SR	Bitmap graphics (Sun Rasterfile) Computing » File Extensions
SR	Kansas City Southern Railway Company Regional » Railroads
SR	S Radhakrishnan Miscellaneous » Unclassified
SR	Saarlädischer Rundfunk International » German
SR	Sad Reject Internet » Chat
SR	Safety Release Governmental » Military
SR	Salt Removal Governmental » Transportation
SR	Sammie Roberts Community » Famous
SR	Sampling Rate Internet
SR	San Rafael, California Governmental » State & Local
SR	Santa Rosa, California Governmental » State & Local
SR	Santana Row Miscellaneous » Unclassified
SR	sarcoplasmic reticulum Medical » British Medicine
SR	saturation recovery Medical » British Medicine
SR	Saudi Riyals Regional » Currencies
SR	Savannah River Academic & Science » Meteorology
SR	Scan Ratio Governmental » NASA
SR	Scanning Radiometer Academic & Science » Ocean Science
SR	scavenger receptor Medical » British Medicine
SR	Schatzki ring Medical » British Medicine
SR	Schedule Ranking Miscellaneous » Unclassified
SR	School Record Academic & Science » Universities
SR	Science Requirement Miscellaneous » Unclassified
SR	Screen Region Computing » General