I was lamenting the use of "semaphore" but wikipedia supports them: > Semaphore (lit. 'apparatus for signalling'; from Ancient Greek σῆμα (sêma) 'mark, sign, token', and Greek -φόρος (-phóros) 'bearer, carrier')[1] is the use of an apparatus to create a visual signal transmitted over distance. https://en.m.wikipedia.org/wiki/Semaphore I was only familiar with: > [A semaphore] is a variable or abstract data type used…
Semaphore flags were for communication between ships. https://en.m.wikipedia.org/wiki/Flag_semaphore Or if your Monty python restaging whuthering heights
Smoke signals are literally the oldest known semaphore, and fire is recorded to have been used to telegraph signals over 700km per hour in the Byzantine Empire.