ISA

Noun

 * 1)   a financial account for investment with special tax rules.
 * 2)   one of a set of professional standards for the performance of audits of financial information issued by the IAASB.
 * 1)   one of a set of professional standards for the performance of audits of financial information issued by the IAASB.

Proper noun

 * 1)   an early type of personal computer expansion slot bus.