Well the subject says it all. I know what a T1 is and does (I install them) However I was recently asked this and was quite embarassed.
Why do clients assume because you have several certificaitons and experience that we know EVERYTHING possible about computers!?
-JMRAL

It's stands for da Terminator ... Govenor of Kalefornyeah.

Q:What is a T1?
T1 is a member of the T-carrier system. T-carrier is a communications system used for carrying voice and data transmissions in a digital format. T1 meets the needs of businesses having multiple users on a system requiring fast speed and broad bandwidth. For a fixed monthly rate, businesses with 20 or more users can communicate via both voice and data. A Full T1 can accommodate as many as 24 users working at 64 Kbps.

Google, it is your friend! :-D

well...the group of connections that include things such as T1, T3's etc...are collectively known as T-carriers...i dont think that there is a word in itself that stands for the T, as i think it goes as far as T-carriers...so any kind of leased line that follows the standards of T1, T3's etc, are called T-carriers..

Ha,
I live in California and I am embarassed that Arnold os our Gov. The google response didn't answer my Q. So I called my favorite CCIE.
T1 stands for Trunk-level 1.
So there we go. I know and now you know as well.
-Thanks though,
Jral23

Wikipedia is also your friend

it sure is your friend, but makes no mention of a trunk-level which is the answer he was looking for
and i was looking around, and yes it does appear it goes further than just a T-carrier :P

Not correct. CCIE is like GIGO (garbage in garbage out).

The T in T-1 stands for "Terrestrial".

Bell used to name carrier lines a,b,c...hijk, skipped a few, s,u,v...blah blah.

They created trunks that carried multiple lines, true. but the T was not designated for trunk because bundling a,b,c q,r, etc. was also done in a trunk.

In 1961 Telstar was put up as the first full SATCOM unit. To DIFFERENTIATE between ground based and space based comms they reverted all ground lines to designated T-1,2,3, etc. (although T-2s are not in practical DS0 (64k) bundles so they skipped odd and used empirical numbers to bundle efficiently until fiber came along) whereby fiber is designated OC for optical carrier which is obviously ground based.

Why not make up some new friends when the old ones get dry