For us, it has a couple meanings:
"Five-0" has come to be a slang term for Law Enforcement.
It originally started with the show "Hawaii Five-0", which was made around a fictitious "Five-0" police division. Since then it has come to represent all Law Enforcement in general. I remember rolling through the neighborhood hearing, "Five-0! Five-0!", sounding the alert from one poo-butt to the next :)
For us, it also represents our commitment to donate 50%, "Five-0", of our proceeds to help support Law Enforcement personnel and their families!
So sound the call, "Five-0! Five-0!" and let's get to work!