WHAT DOES C MEAN?

The + signal is really a simplification from the Latin: et (corresponding to the evolution in the ampersand &).[seven] The − could be derived from the macron ◌̄ created more than ⟨m⟩ when made use of to point subtraction; or it may come from a shorthand version in the letter ⟨m⟩ by itself.[8] Ää C̈c̈ Ëë Ḧḧ Ï ï N̈n̈ Ö�