ISA

Initialism of instruction set architecture.

Initialism of individual savings account, a financial account for investment with special tax rules.

Initialism of International Standard on Auditing, one of a set of professional standards for the performance of audits of financial information issued by the IAASB.

Initialism of intelligent speed assistance / adaptation.

Initialism of isosaccharinic acid.

Initialism of ideological state apparatus.

Initialism of Industry Standard Architecture, an early type of personal computer expansion slot bus.

Initialism of International Seabed Authority, an intergovernmental body set up to regulate deep seabed mining and ensure the marine environment is protected from any harmful effects.