"Transatlantic cables are cables that have been laid along the ocean floor to connect North America and Europe. Before the advent of radio, the only means of communication across the Atlantic Ocean was to physically connect the continents with a transatlantic telegraph cable, which was operative in 1867. The exchange rate between the United States dollar and British pound is still colloquially known as "cable" by financial marketeers on account of the fact that the rate was originally transmitted via a transatlantic cable"
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