T3

T3 or T-3 may refer to:

* A T3 line, properly a Digital Signal 3, a type of telecommunications service, see T-carrier
* T3 magazine, a monthly magazine published by Future Publishing, focusing on new and hi-tech gadgets
* T3 (The Think Tank) is an independent advertising agency and the largest woman owned advertising agency in the US.
* Fuji T-3, a Japanese primary military trainer aircraft
* Tatra T3, a tramcar manufactured by ČKD Tatra
* Tungsten T3, a device in the line of palmOne Tungsten handhelds
* Volkswagen Type 2 (T3), the third generation of the Volkswagen Bus
* UK domestic airline Eastern Airways IATA airline designator
* In topology, see regular space.
* "", a movie starring Arnold Schwarzenegger.
* Tokyo Teleport Town, a planned city on reclaimed land in Tokyo Bay
* In Australia, "T3" is used to refer to the third partial float of the formerly wholly government-owned Telstra telecommunications provider
* Slingsby T-67 Firefly, a U.S. military training aircraft
* T3 is a type of transit lane in Australia
* Paris Tramway Line 3
* A nickname for Tylenol 3 (paracetamol with codeine, or co-codamol), a painkiller

Medicine

* In endocrinology, T₃ is an abbreviation for triiodothyronine; see Thyroid hormone.
* in human anatomy :
** T3 spinal nerve
** Third thoracic vertebra of the vertebral column,
* a non-small cell lung carcinoma staging code for a type of tumour