if you don't mind, if you like, if you're so inclined

nothing

what number, how many (used with a counter) / (used with も) many (used with a counter)

What?, Huh?

what / that thing (used in place of words you can't remember at the moment.)

what

what is this?

Kyūjitai form of 緘黙

Kyūjitai form of 緘黙

(Buddhism) the mouth / (Buddhism) (by extension) one's speech, one's words / the mouthpiece of a flute