(sports, ice hockey) Initialism of International Ice Hockey Federation.

(military, US) Initialism of Individual Integrated Fighting System.

(film) For adults only

A non-standard way to write the Roman numeral II.

plural of IIT

(education, India) Abbreviation of Indian Institute of Technology.

(India, space science) Initialism of Indian Institute of Space Science and Technology. / (software, testing) Initialism of International Institute for Software Testing.

plural of Iitaka dimension

(algebraic geometry) The Iitaka dimension of a line bundle L on an algebraic variety X is the dimension of the image of the rational map to projective space determined by L.

(India) An alum of one of the Indian Institutes of Technology.