double / a person with two nationalities; a biracial person

"Clear file folder", a simple plastic sleeve (perhaps only somewhat opaque when a design is printed on it, as is common in promotional events) for holding documents, open on two consecutive sides and closed on two consecutive sides.

(computing) text file

(computing) a filename

The act of producing peace signs with both hands.

double standard

(mahjong) a 役 (yaku, “winning condition”) for declaring a ready hand on the first go-around of play, worth 2 翻 (han, “doubles”)

double meaning

スキーン腺: Skene's gland

椪柑, 凸柑: Citrus poonesis, a hybrid species of tangerine