Have you ever noticed that radio and television stations in the U.S. start their call signs with the letters W or K? This interesting detail stems from an international agreement made in 1912, during a convention in London dedicated to regulating airwaves. The United States received specific letters for its broadcasting stations.

According to the convention, the call letters A and N were designated for military use, specifically for the Army and Navy. The letters W and K were then allocated for public broadcasting purposes, allowing stations to establish their identities in this fascinating area of communication.