n (colloquial) Clipping of isolation.
n Quarantine measures in order to mitigate the spread of communicable diseases, such as Covid-19.
n (American football, basketball) An isolation play in basketball or American football.
n (organisation) The International Organization for Standardization.
n (file format) A disk image of an ISO 9660 file system (such as a CD or DVD); also used as the file extension for such a file.
n (photography) A measure of film sensitivity or brightness, derived from the ISO standard.
n (category theory) Clipping of isomorphism. [Similarity of form]
n (music, derogatory) Abbreviation of instrument-shaped object. Used to refer to a musical instrument that is of very low quality.
n Initialism of Imperial Service Order.
n (finance) Initialism of incentive stock option.