itt

1. InternetabbreviationinitialismInitialism of in this thread or in this topic.

1. obsoleteObsolete spelling of it.

   1657, October 3, William Clarke, Letters from Flanders; reprinted in:

   1 more example

   Itt hath indeed bin intended by the French army to lay siege to […] and in order thereunto a conquest hath bin made of the sconce Mardyk, which did nott indure siege above 2 dayes before itt yielded uppon discretion,¹ but since the taking thereof the resolution of beseiging Dunkirk beginneth to slacken, and I suppose will bee quitte layd aside for this […]

   1899, William Clarke, edited by Charles Harding Firth, The Clarke Papers: Selections from the Papers of William Clarke, Secretary to the Council of the Army, 1647-1649, and to General Monck and the Commanders of the Army in Scotland, 1651-1660, Camden Society, page 120

plural ITTs

1. abbreviationinitialismcyclingInitialism of individual time trial.
2. abbreviationinitialismaeronauticsInitialism of internal turbine temperature.

1. abbreviationinitialismInitialism of International Telephone & Telegraph, a global American manufacturing company.

1. InternetabbreviationinitialismInitialism of in this thread (the topic of this thread is).
2. InternetabbreviationinitialismInitialism of in this topic.
3. abbreviationinitialismInitialism of I think that.