what

let's see; what have we got here

which (of three or more) / which one /

Nothing

Visualization. / Visual control: a business management technique whereby information is communicated using visual signals in order to facilitate quick understanding or increase efficiency and clarity.

room rent

(Internet slang) dirty room

at-home clothes

an adult son residing with his parents; generally has not yet or can not come into family inheritance / a female servant working in a daimyō, ōoku, or other high-ranking house

when