how many, how much, how far, how long, some, several
幾 centers on an unspecified or indefinite quantity: asking how many or how much, or indicating some or several when the exact number is not given.
幾 originally depicted a small or subtle quantity, possibly from components suggesting fine silk threads and a halberd-like element. The exact historical development is uncertain, but the modern form retains the idea of an indefinite number.
The top part looks like a pair of small threads (幺) over a halberd (戈), with a person (人) tucked inside. Imagine counting tiny silk threads with a weapon nearby, unsure of the exact number: how many? Some, several.
For キ, imagine a key with a question mark on it: you need the key to unlock how many are inside. Key -> キ.
how many
how much
as many as one likes; as much as one likes
some; several; a few
extract (of plants, meat, etc.); essence; concentrate; concentrated stock
(how) many times; (how) often
geometry
somewhat; to some extent; to some degree
many; numerous
some; (a) little
repeatedly; over and over again
how much; how many; what amount; what extent
many months and years
piling up; multiple layers
affine geometry
tincture of camphor
Euclidean geometry
Riemannian geometry
algebraic geometry
topology