Caliborn

uranianUmbra is likely a troll, unknown from an unknown session of the game.

Speculation
uu's symbol is a variant of Ophiuchus different from uranianUmbra's.

Trivia

 * uu's hex code is 32, the atomic number of element Germanium, a brittle grey crystalline element used as a semiconductor. 3 is the difference of 9 and 6.