Funny patterns, that look procedurally generated (like the small avatars we get by default on many fora from the similar scripts). Is it a simple substitution cipher that needs you own software for the seed? (Any pseudo-random data can be defeated.) Top and bottom: are they only visual reminders (like missing Unicode glyphs)?

All I know (too little) is: since it looks quite computed, this is not a safe method (vs. noisier renditions)…

Have fun, anyway!

Thank you for the extra explanations! (we might understand this representation is just a sample of the possibilities.) I remember myself how the pseudo-random function was helpful and quite funny to use, without imagining the incredible applications e.g. in procedural worlds nowadays. “Seed (code point) + proprietary algorithm (undisclosed)”, I get it, but “useful to conceal data”… which data did you encode here? (the code points themselves? this would not be a very helpful example - something must have escaped my notice…) “To create a completely different symbol”, yes, cool, but the pattern-looking glyphs may unveil the presence of a possible code, thus likely your data (hence the need of a 'concealing layer', via steganography for instance, since the pseudo-randomization might not be solid enough against the attacks)… well, I think you know more about this concern than me! Interesting/puzzling stuff. :-)