M-of-N Multisig, Multisig Output
This definition comes from the technical glossary.
Definition
A pubkey script that provides n number of pubkeys and requires the corresponding signature script provide m minimum number signatures corresponding to the provided pubkeys.
Synonyms
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    Multisig 
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    Bare multisig 
Not To Be Confused With
- 
    P2SH multisig (a multisig script contained inside P2SH) 
- 
    Advanced scripts that require multiple signatures without using OP_CHECKMULTISIG or OP_CHECKMULTISIGVERIFY 
Links
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    Multisig — Developer Guide 
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    BIP11: m-of-n standard transactions — Bitcoin Improvement Proposals 
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    What are multi-signature transactions? — Bitcoin StackExchange