Or to put it another way...bounce angle is how much lower the trailing edge of the sole is in relation to the leading edge. According to a Golfsmith blog: here are the bounce angles common with today's wedges:
Lob Wedge 0 - 10 degrees
Pitching Wedge 2 - 5 degrees
Gap Wedge 5 - 12 degrees
Sand Wedge 10 - 16 degrees
Some wedge manufacturers indicate the degrees on their clubs. Others you would have to go to the manufacturer to determine the bounce.
According to Golfsmith... clubs with bounce of less than 8 degrees are considered low bounce. High bounce wedges have bounce degrees above 10. So....which one should you choose?
Your angle of attack is the key....if you generally take a divot with your short irons then you have a steep angle of attack and as some have said you are a "Digger". If the answer is no then you are probably a "Picker".
Diggers will benefit from a wedge with more bounce and a wider sole whereas Pickers will benefit with less bounce and a narrow sole.
If you are unsure... an experienced golf professional or club fitter using a lie board can help you with the proper bounce and sole widths.