noun, noun which may take the genitive case particle 'no'
overhead; above one's head
Refers to the space directly above a person or thing; often used with の to modify nouns (e.g., 頭上注意).
頭上に鳥が飛んでいる。
A bird is flying overhead.
頭上注意の看板があった。
There was a sign warning of overhead hazards.