THCV is the one recently "popular" cannabinoid that is a descendant of a different ancestor than THC, CBD, CBG, and most of the other cannabinoids that you find in products these days.
But just as growers have successfully developed cultivars with dominant "secondary" cannabinoids like CBD and CBG, they have also developed some with THCV as the dominant cannabinoid.
This article covers this unique, appetite suppressing cannabinoid pretty well. If you are lucky enough to have access to THCV in your state, consider yourself lucky. It's not readily available yet, but expect to see more products with THCV in the coming years.