0xd505accf?0xd505accf is the function selector for permit(address,address,uint256,uint256,uint8,bytes32,bytes32). Approves spending via an off-chain signature (EIP-2612).
When a transaction's data begins with 0xd505accf, it is calling permit. The selector is the first four bytes of the keccak-256 hash of the signature permit(address,address,uint256,uint256,uint8,bytes32,bytes32), which is how wallets and explorers work out which function a payload is for.