T4

• In endocrinology, see Thyroxine.
• In topology, see Normal space.
• The T4 phage is a bacteriophage.
• The T4 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 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.