Comment on Scream cipherparentComments−JdeBP11mo… and no, since neither the enciphering nor the deciphering do a 1:1 mapping for all possible input code points.−amenhotep11moThat's not a requirement. Pigpen is a substitution cipher.−JdeBP11moYou will find that the pigpen cipher has a 1:1 mapping between its input alphabet and its output alphabet, and that a 1:1 mapping is a necessity for full invertibility.
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… and no, since neither the enciphering nor the deciphering do a 1:1 mapping for all possible input code points.
That's not a requirement. Pigpen is a substitution cipher.
You will find that the pigpen cipher has a 1:1 mapping between its input alphabet and its output alphabet, and that a 1:1 mapping is a necessity for full invertibility.