The term grid has several meanings in different fields:
In mathematics and geometry, a grid is a system of two sets of lines intersect each other at a fixed angle, usually a right angle (i.e. a set of vertical lines and a set of horizontal lines). See grid plan.
In medicine, GRID was an acronym for "Gay Related Immune Deficiency" and was the accepted name for AIDS prior to 1982.
In Norse mythology, Grid was a giantess who knew that Loki was trying to trick Thor into being killed by Geirrod. She gave Thor her iron gloves and magical belt and staff to fight the frost giant.
... end of the axis to push against the upper rim of the groove, while the other end of the axis pushes against the lower rim of the groove. While the axis is slipping around ...