Someone already mentioned Oggie grips but STX Surgeon had a different shaft shape at the top only for a similar effect.
I guess you could consider any “odd” shaft shape in the answers to this question: Easton Ellipse, CCM Octogun, CCM Ribcor taper, CCM Jetspeed asymmetrical, RBK O-stick, Bauer ER Spine, Bauer Sonic Taper, Trilage triangle hockey shaft.