0x36c78516?0x36c78516 is the function selector for transferFrom(address,address,uint160,address). Permit2 transfer using an existing allowance.
When a transaction's data begins with 0x36c78516, it is calling transferFrom. The selector is the first four bytes of the keccak-256 hash of the signature transferFrom(address,address,uint160,address), which is how wallets and explorers work out which function a payload is for.