wigwagger
/ˈwɪɡˌwæɡər/
noun
- A person who signals by waving a flag, light, or arm, especially in a military or railroad context.
- The experienced wigwagger trained the new recruits in semaphore communication.
- During the parade, the wigwagger stood on the platform and directed the marching bands.
- The old railroad wigwagger retired after forty years of signaling trains.