(Internet slang) main account; main

(Internet slang) sub account; sub

a cappella

(Internet slang) ban from a user account

red turnip (any of several varieties of turnip (Brassica rapa) that are red or purple in color) / radish / beet, beetroot

copper; bronze

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

infrared

a red fox (Vulpes vulpes)