Roman candle
aid to navigation
alarm
amber light
balefire
beacon
beacon fire
bell
bell buoy
blinker
blue peter
buoy
caution light
flare
fog bell
fog signal
fog whistle
foghorn
glance
go light
gong buoy
green light
heliograph
high sign
international alphabet flag
international numeral pennant
kick
leer
marker beacon
nod
nudge
parachute flare
pilot flag
poke
police whistle
quarantine flag
radio beacon
red flag
red light
rocket
sailing aid
semaphore flag
semaphore telegraph
sign
signal
signal beacon
signal bell
signal fire
signal flag
signal gong
apparatus
communicate
intercommunicate
setup
signalise
signalize
semaphored
semaphores
semaphoring
'binge'
Medicare
bitwise
configura
deckedge
detec
dragg
north-north-east