Red Square (a square in Moscow, Russia)

red line / (historical) Short for 赤線地帯(あかせんちたい) (akasenchitai): Akasen (districts in Japan where prostitution and the sex industry flourished)

red brick

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

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

red lead

(obsolete) Soviet Union

(astronomy) right ascension

Kyūjitai form of 赤経 (“right ascension”)

(astronomy) declination