The architectural term representing the last letter of the alphabet was not the end, but actually the beginning of a new movement in architectural ... This includes the zig-zag pattern, diagonals ...

You can spot the zig-zag letters from their zig-zag lines. Let's look at the ‘V’ here. That down up movement makes the zig-zag. ‘W’ is the same, only with more diagonals. Down, up ...