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What does HL stand for?

HL stands for Hinge Line

This definition appears frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

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We have 67 other meanings of HL in our Acronym Attic

Samples in periodicals archive:

And the next time you catch someone doing this, remind them that there's already a warning in the -10-1 TMs that reads: CREWMEMBER WARNING Do not open two skirts at the same time if they have the same hinge line.
Later, in 2002, I identified additional "Emydoidea hutchchisoni" material from the Miocene (Barstovian) of Nebraska and suggested that "Emydoidea hutchisoni" was akinetic (lacked a movable plastron) because of the presence of well developed plastral buttresses and lack of a hinge line in a well-preserved plastron (University of Nebraska State Museum [UNSM] 117938).
Shell dorsibiconvex; transverse suboval to almost subrectangular outline, with maximum width between hinge line and midlength; radial ornament multicostellate, with 11-13 rounded ribs per 3 mm along the anterior margin; ventral muscle field large, bilobed, elongate, extended anterior to midlength; cardinal process undivided.