You send: Tether (TRC20)
Tether (USDT) is a stablecoin designed to track the US dollar, issued on many blockchains at once. The network matters as much as the ticker: USDT on TRC20, ERC20 or BEP20 are not interchangeable at the address level. More about Tether.
On this pair it moves over TRC20 — an address there starts with T — 34 characters.
USDT also exists on other networks — different addresses, not interchangeable: Aptos, Arbitrum, AssetHub, BEP20, Celo.

