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This definition comes from the technical glossary.
A P2SH output where the redeem script uses one of the multisig opcodes. Up until Bitcoin Core 0.10.0, P2SH multisig scripts were standard transactions, but most other P2SH scripts were not.
Multisig pubkey scripts (also called “bare multisig”, these multisig scripts don’t use P2SH encapsulation)
P2SH (general P2SH, of which P2SH multisig is a specific instance that was special cased up until Bitcoin Core 0.10.0)
P2SH multisig — Bitcoin.org Developer Guide
BIP16: pay to script hash — Bitcoin Improvement Proposals
What are the limits of bare multisig and P2SH multisig? — Bitcoin StackExchange