Pig Pen or Domino code 

The code is quite simple, but looks complex and goes as follows:-

Draw a 3 x 3 naughts and crosses (tic tac toe) grid with the alphabet arranged in the squares as shown below. To encipher a message each letter of the alphabet is encoded by indicting the type box that it is in and a way of indicating its position. 

F=		or		or

An example of it in action is shown below, taken from a message intercepted by Agent Kat:

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