jargon question on workholding?

I have a dim memory that in engineering a distinction
is made between holding work such that it truly
cannot move (e.g. an object held in a bench vice cannot
rotate round a vertical axis, since the jaws are in the
way), and holding work only by friction
(e.g. an object in a vice can slide up and down,
if enough force is applied).
I *think* there are jargon terms for these
two notions.
Can anybody tell me what they are,
or (alternatively) wether I'm
misremembering badly?
BugBear
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bugbear
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You did say jargon?
Purfeck and Prayer respectively? :-)
Tom
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Tom

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