Semaphore -- signaling with flags

Last night's Final Jeopardy question was, “Fittingly, the cover of this Beatles album shows the Fab Four engaging in a semaphore message.”

semaphore noun [from the Greek sema (sign, signal) + phore (carrying)]

1. an apparatus for visual signalling (as by the position of one or more movable arms)

2. a system of visual signaling by two flags held one in each hand

Jeopardy host Alex Trebek noted that the Moptops' semaphore letters actually spelled N-V-U-J because H-E-L-P didn't look particularly aesthetically pleasing.