a red paper lantern, typically used as a sign marking an izakaya, an inexpensive Japanese pub / (figuratively) an izakaya

(mahjong) red tile; unique to Japanese mahjong and used to score bonus points

a red papier-mâché bobblehead cow toy, a kind of regional omiyage regarded as symbolic of the Aizu region of Japan

red lead

(idiomatic) a complete stranger

a red sun, a bright sun, or the summer sun / a day in the traditional Japanese six-day week which is unlucky except for at noon

red light of traffic lights, red signal

(offensive, Internet slang) Alternative form of 子供部屋おじさん

(offensive, Internet slang) a man whose age is greater than about thirty or forty who lives in one's child room and with one's parent(s).

single room