外汇 wàihuì foreign (currency) exchange
How to remember 外汇: 外 outside + 汇 to gather = foreign (currency) exchange.
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How it is used
- Foreign exchange (forex) - 外汇储备 (wàihuì chǔbèi) foreign exchange reserves; 外汇市场 (wàihuì shìchǎng) the forex market.
- An economics/finance term for foreign currency holdings and their trading; broader system-level word than 外币 (wàibì, the currency itself). Formal.