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 ...

The Einstein zig-zag could help resolve this issue by providing ... appearing as a distorted red arc in the images. This dual role enables precise measurements of its mass, star formation history ...