Fiber
a.k.a. Fibre, EUR/USD
Trader slang for the EUR/USD pair.
In plain English
Trader slang for the EUR/USD pair.
Fiber is the trading-floor nickname for EUR/USD. A popular explanation is that it nods to the fibre-optic cables that replaced the old telegraph cable (GBP/USD's nickname) for carrying prices across the Atlantic.
Whatever the origin, if a dealer says 'fiber's bid', they mean buyers are lifting EUR/USD.
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