Undecipherable handwriting or secret symbol.
Any symbol used in this system; a hieroglyph.
A writing system of ancient Egypt, Minoans, Maya and other civilizations, using pictorial symbols to represent individual sounds as a rebus
difficult to decipher
of, relating to, or written with this system of symbols
Something which is incapable of being discerned.
Not capable of being discerned, of being perceived.
Not capable of being distinguished from something else.