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

(literally) red beard; a man with a red beard / a Ryukyu robin, Larvivora komadori

insight / penetration (of a problem)