A hinge.
"Researchers are studying HARs to understand how they contributed to brain development in humans."
Acronym of human accelerated region.
In plain English: A har is an old-fashioned term for a large, flat-bottomed boat used to carry heavy loads across water.
"The children decided to have ice cream for their afternoon har."
A sound of laughter, with a sarcastic connotation.
"She gave a sharp har at his suggestion that we could finish the project by noon."
The word "har" comes from Old English heorra and originally meant a hinge. It traveled into modern usage to refer to the pivot point of a door or gate.