My screen name, 5by5, harks back to the days of analog radio communication. It’s a subjective quality scale for signal strength and signal clarity from 1 to 5.
It basically means “loud and clear.”
For more info see: http://en.wikipedia.org/wiki/Five_by_five
I remember those days when someone would call in for a radio check, tweak it a little and call in again. It got so that our reply was "2by2". They'd invariably come back and ask "2by2?"
My answer was:
2 Loud, and
2 Often