What is "lh"

LH \LH\ n. (Biochem.) An abbreviation for luteinizing hormone, a gonadotropic hormone that is secreted by the pituitary and stimulates ovulation in female mammals, and stimulates androgen release in male mammals. [Acronym]

Syn: luteinizing hormone, interstitial cell-stimulating hormone.

__NOTOC__ LH, Lh, or lh may stand for:

• Laurel and Hardy
• Leasehold (Tenure)
• Left-handed or left hand
• Letterhead, the heading at the top of a sheet of letter paper
• lh, a digraph for many languages
• LH (DOS command), a DOS command that loads a program into the upper memory area
• A type of Single-mode optical fiber
• LH platform, a type of Chrysler car made from 1993 through 2004: New Yorker, 300M, Concorde, LHS, Intrepid and Vision
• The Literary and Historical Society, the debating union of University College Dublin
• " Little Hide", 1998 debut single by Snow Patrol
• Linkhero
• Lovehammers
• Late Helladic period in the history of ancient Greece during the Bronze Age

In computational complexity, the logarithmic time hierarchy (LH) is the complexity class of all computational problems solvable in a logarithmic amount of computation time on an alternating Turing machine with a bounded number of alternations. It is a special case of the hierarchy of bounded alternating Turing machines. It is equal to FO and to FO-uniform AC0.

The ith level of the logarithmic time hierarchy is the set of languages recognised by alternating Turing machines in logarithmic time with random access and i − 1 alternations, beginning with an existential state. LH is the union of all levels.