Σ (Sigma) was the personal Ood of Klineman Halpen, the manager of Ood Operations. This particular Ood could be identified with the large Greek letter "Sigma" (Σ) on the right side of his uniform. - TARDIS Data Core
I really enjoyed working on this one, the intricacy of the lines on his face were particularly difficult to get right but I think I got there in the end.
Total Painting Time: 22 Hours.