poka-yoke
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
A design feature or fixture that makes an error physically impossible or instantly obvious.
A simple poka-yoke on the jig means the bracket only seats one way, so it can't go in backwards.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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