The result is a 6 × 10 matrix of important symbols in physics and astronomy, each linked to a 5–10 min video describing the symbol ... Some of the choices are far from obvious; the lower-case Greek ...

In physics, why are only Greek letters such as delta, sigma, gamma, etc. used as symbols? It is to honour the Greek language. The Greek alphabet, which has been in use since about 9 B.C., was the ...