There appear to be different types of mower cutters. One which I've seen advertised is a "slasher mower" (this is an attachment for a tractor).
How does a slasher mower work?
(My Google-Fu is weak - I can't find anything specific on how they cut, and what differentiates them - other then that they are good for long grass, but do not cut fine - from the typical mower I'm familiar with - ie a spinning horizontal blade or 2 or 3)