You send: Sui
Sui is a proof-of-stake layer 1 built around an object-based data model and the Move language, with finality in under a second. SUI pays for gas and is staked to secure the network. More about Sui.
On this pair it moves over Sui — an address there starts with 0x — 66 characters.
SUI lives on a single network here, so there is no wrong-chain version of it to confuse it with.