What are symbols and why are they used?
They are used to enable people to communicate. After all, you
are reading this answer in the form of 26 symbols (plus a few for
punctuation). The only significance for the letter "c" is that
which is accorded it by the common convention that both of us
In a different context, and with a different audience, the same
letter could have meant:
- the intercept of an equation of a straight line,
- the constant of proportionality in a direct or inverse
- the constant of integration in an indefinite integral,
- the speed of light in vacuum,
- 100 (Roman numeral).
Moreover, if I had written in code the same symbol could have
meant something quite different.