What does HGH stand for?

Hangzhou - China - Airport symbol (OAG)

Historische Grammatik der Hebraeischen Sprache - H. Bauer and P. Leander - A publication (BJA)

Hughes & Hatcher, Inc. (SAUO)

Hughes Craft, Sanger, TX - Manufacturer code for watercraft hull identification number (USCG)

Human Growth Hormone - Also, hGH - Endocrinology