Did you ever realize that when you look at a newspaper or an internet page the type you see is the result of a design process as old as mankind? Through centuries the symbols used to communicate gradually developed into the characters and signs we use today.
A sign created “spontaneously”.
This character can be written as Unicode codepoint U+24B6: Ⓐ.
In addition, the “@” sign or “(A)” can be used to quickly represent the “circle-A” on a computer.