11.   Cab drivers would use their signals, movie directors would cut the guns and gore, lawyers would get to the point.

12.   Cellphone companies could use incoming signals to constantly monitor the location of their customers.

13.   Current cellular services use analog signals, in essence, waves.

14.   Deaf since infancy, Chris Sullivan attended a special school at which pupils who used hand signals were smacked with a ruler.

15.   Cross Country Wireless holds licenses to beam cable programming to viewers throughout Southern California using microwave signals.

16.   Digital phone systems already use digital signals, so a modem has nothing to do.

17.   Drills, saws and jackhammers roar so loudly that hand signals must be used.

18.   Different countries use different signals, such as a standing figure and a walking figure in South American locations.

19.   Every incident must be investigated, which takes time, especially because the troublesome beacons use anonymous signals.

20.   Federal Express, for example, uses the signal to track the status of shipped packages and relay them to customers via their website.