Signature Hash
This definition comes from the technical glossary.
Definition
A flag to Bitcoin signatures that indicates what parts of the transaction the signature signs. (The default is SIGHASH_ALL.) The unsigned parts of the transaction may be modified.
Synonyms
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Signature hash
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Sighash
Not To Be Confused With
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Signed hash (a hash of the data to be signed)
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Transaction malleability / transaction mutability (although non-default sighash flags do allow optional malleability, malleability comprises any way a transaction may be mutated)
Links
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Signature hash — Bitcoin Developer Guide
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OP_CHECKSIG — Bitcoin Wiki
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Contracts — Bitcoin Wiki