Proto-Sinaitic script
Because there are so few Proto-Sinaitic signs, little is known with certainty about the nature of the script. The script co-existed with Egyptian hieroglyphs, so it is likely that it represented true writing, but this is not certain.  From the shape of the signs, Proto-Sinaitic may be an alphabet, and the ancestor of the Phoenician alphabet, from which nearly all modern alphabets descend.