vanity metric
B1CEFR level
50/100Rarity: uncommon
TechnicalRegister
A figure that looks impressive but does not inform decisions or correlate with real business value.
Total registered users is a vanity metric; monthly active users tells us far more.
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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