A monoalphabetic substitution cipher used as early as the 1700s, and is still a staple of cryptography as an example of a simple cipher. Rather than substituting letters for letters it subsitutes symbols.

I know this isn't going to look good, but here it goes.

  A | B | C         J | K | L
 ___|___|___       __.|_._|.__
    |   |             |   |
  D | E | F         M.| N |.O
 ___|___|___       ___|_._|___
    |   |            .| . |.
  G | H | I         P | Q | R

  \ S /              \ W /
   \ /                \./
  T V U              X.V.Y
    ^                  ^
   / \                /.\
  / V \              / Z \
To encrypt a message take the plaintext and replace the letters with the portion of the grid where the letter is found. For example "sample" would be
           ___  ___        ___
\   /    |    |   .| |    |   |
 \ /     |   .|    | |    |   |
  V   ___| ___|    | |.__ |___|
Simple eh! Just don't try to do this in ASCII. :)

Source: The Code Book

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