What does T.T. stand for?

What does T.T. mean?

TT	Top This Internet » Chat
TT	Top Touring Governmental » Transportation
TT	Top Tunes Miscellaneous » Unclassified
TT	Topic To Text Miscellaneous » Unclassified
TT	Topologically Tame Academic & Science » Ocean Science
TT	Toronto Trek Governmental » Transportation
TT	Torpedo Tube Governmental » Military
TT	Torsion Twist Academic & Science » Physics
TT	Total Temperature Governmental » NASA
TT	Total Temporary Miscellaneous » Unclassified
TT	Total Time Medical » Physiology
TT	Total Time Governmental » NASA
TT	Total Turkey Miscellaneous » Food
TT	Total Twat Miscellaneous » Unclassified
TT	Totally Terrific Internet » Chat
TT	Touch Tone Computing » Telecom
TT	Touring Trophy Community » Sports
TT	Touring Tursimo Governmental » Transportation
TT	Tourist Trophy Community
TT	Tourist Trophy Community » Sports
TT	Tournament Terrors Community » Sports
TT	Tous Temps International » French
TT	Township Treasurer Business » Positions
TT	Track and Trail Community » Sports
TT	Trade Type Business » Stock Exchange