Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by form]
8. [single built works by form: massing or shape]
9. towers (single built works)

Narrower term/s

• railroad signal towers [NP][+]
  • railroad signal houses
• telecommunications towers [NP][+]
  • radio towers
  • television towers
  • transmission towers
  • cell towers

Anotations

Scope note:

General term for elevated structures, either open or enclosed, from which signals of any kind are sent, including telegraphic, electronic, or manual signals. Examples are towers in the Great Wall of China and towers used to relay railroad signals.