The Egyptians knew that the form of the upper lip could depict the sound for M. Therefore they took the sign for the letter M from the picture of the
upper lip.
From this sign, the letter that we use for the beginning of the word mouth emerged, and the letter is also valid for any other word beginning with the same sound. In this way, the picture sign for the beginning of a word became the sign for a sound.
From this sign, the letter that we use for the beginning of the word mouth emerged, and the letter is also valid for any other word beginning with the same sound. In this way, the picture sign for the beginning of a word became the sign for a sound.