An extension cord.

A barcode: a set of machine-readable lines of varying width placed on products to represent pricing or other such data.

ZIP code (US postal code)

chord progression

(computing) kuten code, the 4-digit codepoint of a character according to its location in JIS encodings

(computing) character encoding

to play an instrument skillfully, freely

everything

(colloquial) current boyfriend

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)