The Pigpen Cipher is a popular encryption method. There are different versions of it. This is the most common one:

Freimaurer-Pigpen-3

The following text has been encrypted with this method:

Freimaurer-Pigpen-1-Message

This version is used in the computer game Assassin’s Creed II:

Freimaurer-Pigpen-4-AssassinsGreed

Here is a different version:

Freimaurer-Pigpen-2

Blog articles that refer to the Pigpen Cipher: