T. Singh was a Starfleet officer in the 23rd century.
Singh was listed as a Fleet Ops officer on the dedication plaque of the USS Shenzhou and as a Science Ops officer on the dedication plaque of the USS Discovery. (DIS: "The Vulcan Hello", dedication plaque; DIS: "Context Is for Kings", dedication plaque)
This character was only mentioned in writing.
This officer was named after first assistant director Tim Singh.