TCARS

From Memory Alpha, the free Star Trek reference.

TCARS is an acronym for the Computer Access and Retrieval System used aboard 29th century timeships. It is the successor to the Federation's starship LCARS. It can be operated by touch or by simply moving one's hand over a control surface.

The TCARS computer system was used aboard Wells-class timeships, such as the USS Relativity. On the Relativity, it could be used to locate past problems in a timeline along with performing normal starship computer routines. (VOY: "Relativity")

The "T" probably stands for "temporal," since the Relativity has been established to have a mission profile using and regulating time travel, but this was only alluded to by the inclusion of the term "TCARS" in displays.

The on-screen appearances of term "TCARS" is entirely in lower case letters, and wasn't spoken in dialog. It appeared on the viewscreen diagrams, and in a series of dialogs depicting the temporal disruptor and the Kazon encounter.