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If you mean , is the letter 'C' symmetrical? Then the answer is YES!!! . It has one line of symmetry . The line of symmetry is an horizontal line through the letter 'C'.
A Euro.
I can think of no Greek symbol of a C with one horizontal line through it; but a C with two horizontal lines through it (as in €) is the symbol for the EURO currency as used in Greece and the rest of the Eurozone (including France, Germany, Italy, Holland, Spain, etc).
The graph of ax + by = c is a straight line going through the points (0, c/b) and (c/a, 0).
Collinear.