At the gate of the tower were two that had three
Who without doubt could all passersby see.
Immovable like stone they seemed not to care
but to the lament of some they were well aware.
Silent watchers
The Two Watchers (also known as the Silent Watchers) were two carved figures that guarded the gateway of the Tower of Cirith Ungol with a strange and malevolent will, inhabited by "some dreadful spirit of evil vigilance".
Tolkien Gateway: Two Watchers
Content contributed by Scott Baltes