What is a 321 ratio?

this is probably meaning a 3.21 gear ratio. it is 3.21:1. this means that for every 3.21 rotations og the driveshaft, the wheels will make one rotation. Its 3 to 1. If you've got 3 bananas and I've got 1 banana, then the ratio of bananas between you and me is 3 to 1 or 3:1... and on a side note, whats up with hording all the bananas.