We have symbols for everything but there is no symbol for "example" despite examples being fundamental to achievements.

Why is there no symbol for "example" when there are symbols for everything else?

I'd like to be able to write a formula and then have a symbol that is commonly understood to represent that what is presented is an example.

Why is this not a good idea and was not introduced?

For example:

E=hf ¤: f=3Hz... if we use ¤ as symbol for an example