What does HBK stand for?

Habekacin - Antibacterial

Handbook

Hardback - Book cover (NTCM)

Hardwood Bleached Kraft - Pulp and paper technology

Hartebeesthoek - South Africa - Geomagnetic observatory code

Hartge's Boat Works, Grasonville, MD - Manufacturer code for watercraft hull identification number (USCG)

Hatchback

Hinchinbrook, AK - Location identifier - FAA (FAAL)

Hollow Back - Of lumber (BARN)

hollowback (SAUS)