The shape is meant to be an “x” overlapping with an “i”, drawn with a single stroke — except for the dot, which is singled out. I realized later that it looks like a thinking person, which is a nice coincidence.
This version of the logo is made in SVG and designed so that the cyan part consists entirely of straight line segments and circular arcs, whose endpoints all lie on a square lattice. The dot lies in the center of the most complete circular arc and is distinguished by both size and color. It was a nice exercise in geometry.
The colors don't really mean anything, I just like them.