ISA

(computing) Instruction set architecture.

(computing) Industry Standard Architecture, an early type of personal computer expansion slot bus.

(UK, finance) Individual Savings Account, a financial account for investment with special tax rules.

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

(Europe, transport) Intelligent speed adaptation or Intelligent Speed Assistance

(chemistry) isosaccharinic acid