Editing Pigpen cipher (section)

{{Short description|Type of substitution cipher}}
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[[File:Pigpen cipher key.svg|thumb|The pigpen cipher uses graphical symbols assigned according to a key similar to the above diagram.<ref name=wrixon-182>Wrixon, pp. 182&ndash;183</ref>]]
The '''pigpen cipher''' (alternatively referred to as the '''masonic cipher''', '''Freemason's cipher''', '''Rosicrucian cipher''', '''Napoleon cipher''', and '''tic-tac-toe cipher''')<ref name=barker>Barker, p. 40</ref><ref name=wrixon-27>Wrixon, p. 27</ref> is a geometric [[simple substitution]] [[cipher]], which exchanges letters for symbols which are fragments of a grid.  The example key shows one way the letters can be assigned to the grid.