Jacob's thigh was disabled by the Angel, to show the patriarch that his prevalence was through his faith and prayer, not through force, Genesis 32:25-31. Smiting the thigh was a gesture of self-condemnation and grief, Jeremiah 31:19 Ezekiel 21:12.
In general, a datum is a base elevation used as a reference from which to reckon heights or depths. A tidal datum is a standard elevation defined by a certain phase of the tide.
Datum targets are . symbols that describe the shape, size, and location of gage elements that are used to establish datum planes or axes. Datum targets . are shown on the part surfaces on a drawing, but they actually . do not exist on a part. Datum targets describe gage elements. The gage elements only contact a portion of the part surface. Datum targets can be specified to simulate a point, line or area contact on a part. The use of datum targets allows a stable and repeatable relationship for a part with its gage. Datum targets should be specified on parts where it is not practical (or