Seal

The word seal occurs several times in the DWU:
== As symbol associated with an office ==
* Seal of Rassilon, a Time Lord seal of state of uncertain application (TV: The Invasion of Time, Doctor Who, and others)
* Great Seal of Diplos (TV: The Stones of Blood)
== As locking mechanism ==
* Deadlock seals, an effective barrier against sonic devices. (TV: School Reunion, The Time of Angels and others)
* Hardinger seals, as used on Bowie Base One (TV: The Waters of Mars)
== Animals ==
* Seal (animal), Earth marine mammals, referenced in TV: Horror of Fang Rock