An interesting note for golfers is that a North American member of the Diospyros family is the American Persimmon (Diospyros virginiana), the traditional wood that "woods" were made of before the advent of metal and carbon fiber club heads. With a specific gravity of about .79 it's not in the ironwood class but its interlocking grain structure combined with its uncommon hardness made for a virtually indestructable club head with the unique ability to efficiently transfer potential energy to a golf ball.....that is, when properly swung.

This is another tool which looks as if the pattern has been drawn with black ink.  Approximately 2-3/4" long. 3/4" wide and just under 1/4" thick.