This is a font of the Pigpen Cipher used on the 1794 tombstone of James Leeson in the graveyard of Trinity Church in Manhattan.  The original cipher does not include a J or . [period] so I have added them to the two unused (and thus, available) spots of the grid.

Uppercase and Lowercase letters are the same.  There are no numbers nor punctuation (with the exception of the period mentioned above).