That's a Shift code you can redeem in multiple Borderlands games, rewarding you with 50 golden keys for each one, or 50 skeleton keys in Tiny Tina's Wonderlands. If you redeem it in Borderlands 3 ...

It didn't take long for someone to figure it out. Specifically, Twitter user @40_BaySt and his wife cracked the code. "It's a binary code", he explained. "Up triangles are 1. Down triangles are O.