I'm thinking of something like "hairpin" or "miniature": this hairpin/miniature piece of knowledge is only useful when someone is choking on a black, titanium ball-pen while sitting on their head.
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2Maybe you'd like trivia. This bit of trivia is only useful when...– JimCommented Sep 23, 2015 at 5:02
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1Sounds like you're thinking of minutia or (more likely) minutiae. These days though this suggests something inconsequential as well as small, which may not be what you're after.– JHCLCommented Sep 23, 2015 at 15:41
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4 Answers
Perhaps you could try minute or minutiae to be more precise.
minutiae
noun the small, precise, or trivial details of something.
If you're looking for an adjective to describe something really small and detailed, well you could use minute or intricate.
noun
attentive to or concerned with even the smallest details:
intricate
noun
very complicated or detailed
Is itty-bitty (aka itsy-bitsy) the figurative expression you're looking for?
itty-bitty: extremely small, tiny
Particularly relating to knowledge or information, you could use nugget:
anything small but of great value or significance: nuggets of wisdom.
How about 'minuscule'?
adjective
extremely small; tiny.
Synonyms
minute, microscopic, nanoscopic, micro, miniature, infinitesimal