HH

Meanings

1. Initialism of Her Highness.
2. Initialism of His Highness.
3. Initialism of His Holiness.

1. Initialism of Hansestadt Hamburg, the German city of Hamburg; used on licence plates and informally in other contexts.

1. Initialism of heavy helicopter.
2. Initialism of household.

1. Initialism of heavily hinged.

1. Abbreviation of hands (one hand being four inches).

1. Synonym of hhh (“a sigh; laughter”).

1. A protein expressed in the larva of the fruit fly Drosophila melanogaster, required for the proper development of the larval body.
2. The gene coding for the Hh (Hedgehog) protein.
3. The signaling pathway involving the Hh (Hedgehog) protein, and its homologues in other animals.

1. A blood group system involving the presence of either the H or the h antigen on the surface of a person's red blood cells.

Etymology

Initialism of Hedgehog; the gene and the signaling pathway are named after the protein.