Sash of Rassilon

From TARDIS Index File, the free Doctor Who reference.

The Sash of Rassilon gave those who wore it protection from the gravitational and energy forces which eminated from the Eye of Harmony, it also allowed for some control of the Eye of Harmony. However, it had less power than its reputation suggested and would not have saved the Master had opened the Eye fully. (DW: The Deadly Assassin).

It is one of the many Artefacts of Rassilon which are given to a newly elected President of the High Council. (DW: The Invasion of Time) It is also a sacred item as the Time Lords bow down to it. (DW: The Invasion of Time)