Answer:

semaphore

Answer	Crossword Clue
SEMAPHORE	Visual signaling apparatus
SEMAPHORE	Signaling device
SEMAPHORE	System of signaling.

SEMAPHORE	Signal.
SEMAPHORE	Engineer's guide.
SEMAPHORE	Signal Corps specialty.
SEMAPHORE	Signaling apparatus.
SEMAPHORE	Flagging conversation?
SEMAPHORE	Communication means at sea
SEMAPHORE	Signal flag

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.