power, exponent
冪 centers on the mathematical concept of repeated multiplication: a power or exponent. The idea is one number raised to the strength of another.
冪 combines 冖 (cover) with 幕 (curtain), originally meaning a cloth cover. Its use for mathematical exponent is a later repurposing, likely from the idea of covering or multiplying layers.
Imagine a curtain (幕) being pulled over (冖) a number, hiding it under layers of multiplication. Each layer is a power, so 冪 means exponent.
For ベキ, picture a baker (ベーカー) covering dough with a curtain to let it rise exponentially: baker -> ベキ, and the dough multiplies in power.
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power
power of two
square (of a number); second power
exponent; power
exponential operator (**)
billowing (clouds, dust)
unipotent
exponent; power
nth root; radical
idempotent
idempotence
nilpotent
nilpotent element
ascending powers
descending powers