Submission Grappling.
My instructor was a pro boxer and muay thai fighter who after his career ended turned his strong TMA background into his livelihood (his main style was Goju Ryu Karate), but never stopped evolving, never stopped learning. So it's not true to say BJJ although that's obviously the primary style. Everything we do is No-Gi, though, so I feel that the distinction must be set forth. If I had to break it down, though, it would probably look like this:
1) BJJ
2) Judo
3) Goju Ryu
4) Aikido
We do little with the last two, but when we do self defense, we learn many illegal moves and unorthodox submission holds that would be more valuable on the street (where the attacker is assumed to have a weapon, or friends), and most of these come from the his goju-ryu background and the aikido he knows (although that's a peripheral style even to him).