Head
From Memory Alpha, the free Star Trek reference.
The head is the uppermost part of a humanoid, it contains the brain, skull, eyes, ears, nose and mouth.
Data's head was once left in the past under the city of San Francisco for more than 500 years. (TNG: "Time's Arrow").
- Head can also refer to a toilet, although this term was used in "Star Trek: The Next Generation USS Enterprise NCC-1701-D Blueprints" and not any canon productions.
