Initialism of Hansestadt Bremen. The German city of Bremen. (Used on licence plates and informally in other contexts.)

hard black (describing a pencil that makes lighter marks than a grade B, but darker marks than a grade H pencil).

(stars) Initialism of horizontal branch. / (slang, seduction community) A hot babe, someone pickup artists try to seduce. (Usually followed by a number in the 1-10 scale of physical beauty, e.g. HB10.)

plural of HB

(television) Initialism of Home Box Office., a premium movie and entertainment channel

(aviation, travel) Initialism of hand baggage only. (fare type)

Abbreviation of health-and-beauty aid.

(UK, historical) HBOS, a former British bank and insurance company.

Initialism of hole-board test. / (textiles) Initialism of herringbone twill.

(UK, military, nautical, obsolete) Initialism of His/Her Britannic Majesty's Ship, replaced by HMS (His/Her Majesty's Ship).