ring / (algebra) ring

an ancient bracelet strung with jewels or bells and worn at the elbow / a longer tube-shaped gauntlet to protect the hand during archery

circle, ring, wheel

circum-

a ring or circle shape (such as a ring for a finger, or Saturn's rings) / a hoop (such as for a barrel) / a wheel (as of a vehicle)

to come to mind; to occur to

(idiomatic) to come into mind, to pop into one's head

(literary) they (about women or girls)

蛍(ほたる)の光(ひかり)窓(まど)の雪(ゆき) (hotaru no hikari mado no yuki, “firefly's dim light, snow reflected on the window → diligent study”)

a placename, such as that of a city in Yamaguchi Prefecture / one of the bullet train services running on the 東海道 (Tōkaido) or 山陽 (San'yō) shinkansen / a surname / a female given name