What does T4 stand for?

MLA style: "T4." Acronym Finder . 2013. AcronymFinder.com 21 May. 2013 http://www.acronymfinder.com/Ten_Four-(T4).html
Chicago style: Acronym Finder . S.v. "T4." Retrieved May 21 2013 from http://www.acronymfinder.com/Ten_Four-(T4).html
APA style: T4. (n.d.) Acronym Finder. (2013). Retrieved May 21 2013 from http://www.acronymfinder.com/Ten_Four-(T4).html

Ten-Four

This definition appears very rarely and is found in the following Acronym Finder categories:

Slang/chat, popular culture

Other Resources:

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T3 Resin Uptake Testing and Test Control Notation Version 3 User Conference The Way We Were Train-the-Trainer Workshop (international drug interdiction training; US State Department) Tactical Terminal Technology Working Group Thoracic White Rami 3 (nerve) T-carrier 4 (digital transmission line, 274.176 Mbps, 4032 voice channels) Teens and Teachers Teaming for Technology Tekken 4 (video game) Tekken Tag Team Tournament (video game)		Terminator 4 (movie) Thyroxine (thyroid hormone) Topological Space (mathematics; topology) Turbocharged 4 cylinder (Volvo) Tools for Technologically Enhanced Education Tea for Two temperature of 42.0 degrees C Tomoyo42's Room (web comic) 644 Voice Circuit Leased Line (DS3, AT&T Terminology) Human Breast Cancer Cells

Samples in periodicals archive:

Heads-up with Grant Hinkle in a $1,500 side event after seeing off 3,927 other players, including Chris Ferguson and Theo Tran at the final table, Akenhead had his chips in with ace-king against ten-four, only to see the flop come down ten-ten-four, followed by the other ten on the turn.

Does he think he can win? YOU BET; The only Briton on the World ...