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The word seal occurs several times in the DWU:
As symbol associated with an office Edit
- 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 Edit
- 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)