noun: (computer hardware, trademark, informal) A USB flash drive.
noun: (computing, trademark) Initialism of Universal Serial Bus; a serial bus standard for connecting devices. [(computing) An international standard for interconnecting personal computer devices using simple plugs and sockets and lightweight cables.]
noun: (communication, space science) Initialism of unified S-band (a communication system used for the Apollo program).
noun: (communication) Initialism of upper sideband.