For many of the symbols below the symbol is usually synonymous with the corresponding concept ultimately an arbitrary. N N displaystyle nu N nu N. It employed the vertical stroke for a one and symbols for 5 10 100 1000 and 10000.
A A displaystyle alpha A alpha A.
So S means to sum things up. Greek Letters are widely used to denote the various mathematical constants and values. Symbols in this category. A A displaystyle alpha A alpha A.