I am too lazy to look it up now, but you can find it in Avis forum there is a similar thread. It is the amateur sports club code.

EDIT

I see you already asked questions in Avis forum. Both codes you asked for would require ID - the Avis employee and FL state employee.

You would not find high discount for car rental in Feb in FL due to the high season demand.

In fact, Hertz each year have CHEAP one-way rental rate for people to drive cars to FL in Winter and then same thing for people drive car out of FL starting from June.