Variations of this cipher were used by both the Rosicrucian brotherhood[6] and the Freemasons, though the latter used the pigpen cipher so often that the system is frequently called the Freemason’s cipher. They began using it in the early 18th century to keep their records of history and rites private, and for correspondence between lodge leaders.
Source: Pigpen cipher – Wikipedia
Tim B.
See also: kolam, celtic knotwork