User blog comment:Master Sima Yi/Assassinews 02-03-'12 — Leaked AC3 info!/@comment-71.224.75.183-20120305024539/@comment-180.200.138.9-20120305071529

It is on his left wrist in his main character picture, on the arm that is holding the pistol. (The picture is used as the background on this wiki). It is not as fancy as Ezio's or Altair's, but it is unmistakebly a blade.