it is a symbol referring back to itself, naming its own form
Explanation: It's talking about how a dictionary entry is self-referential. I think you just have to alter this one to make it make sense in English, because a more literal translation doesn't come across very well.
Explanation: a letter/character standing to represent its own shape
e.g. A-frame, C-spanner, I-beam, S-bend, T-junction, U-turn
segno
espressione grafica convenzionale di concetti, enti matematici e sim.: i segni dell’alfabeto italiano sono ventuno www.demauroparavia.it/105598
Robert Tucker United Kingdom Works in field Native speaker of: English