T4

T4 or T-4 is used for various purposes as a designation, abbreviation or identifier:

T4 is the IATA code for Hellas Jet airline
In endocrinology, see Thyroxine.
In topology, see Normal space.
The T4 phage is a bacteriophage.
The T-4 Euthanasia Program was established by Nazi Germany in order to maintain the supposed purity (eugenics) of the so-called Aryan race by systematically killing children and adults born with physical deformities or suffering from mental illness.
An aircraft, the Kawasaki T-4
T4 (Channel 4) is a Sunday morning teen-aimed slot on Channel 4 (UK).
In Canadian tax law, a T4 is a renumeration of income tax and other deductions taken by the government over the period of one fiscal year, and is used in filing an Income Tax Return.
In anatomy, T4 is the 4th thoracic vertebra or the T4 spinal nerve.
T4 is also a Gamemaker Resource Site located at http://www.t4games.com
T4 is also the name of an upcoming movie from skmastaz films
T4 is the short name for Marc Miller's Traveller Published by Imperium Games, Inc.
The T-4 Atomic Demolition Munition was a small tactical nuclear bomb.
The Terminal 4 of Madrid Barajas International Airport.