Signum was a female Vulcan active in the Federation Starfleet in the early 25th century. In 2412, Signum was part of Starfleet Special Operations Section 6 under the Starfleet Technical Intelligence Group. On 18 August she visited Bajor, arriving in Hathon after Sobaru Lanstar's funeral. She visited Lanstar's widow Tiana Lanstar and made her an unspecified offer from Signum's superior. (The War of the Masters: "The Only Way to Go") In the Masterverse, STIG is a front organization for Section 31, but it is unclear in "The Only Way to Go" whether Signum is aware of this.