It used to be just ZTR, "Zero Turn Radius".
I've got about 2 acres of yard, interspersed by a garden, grape vineyards, blackberry trellis, fruit and nut trees and the obligatory shrubs, bushes and barns.
A ZTR would be nice, but I can't see spending $4 to $5K for a lawnmower.
I have a Troybilt, 42" cut, rider. A lot cheaper and does the job just fine.

....and yes, I'd have a ZTR in a heartbeat....if I could talk myself into turning loose with that much cash! LOL!