Abbreviation with multiple meanings, commonly 'First Day Cover' in philately or 'Fire Department Connection' in building systems. Context determines specific meaning.
As an acronym, each instance has its own etymology based on the constituent words. 'First Day Cover' dates to early 20th-century stamp collecting, while 'Fire Department Connection' emerged with modern firefighting infrastructure.
First Day Covers represent a fascinating intersection of postal history and collecting - these specially marked envelopes from a stamp's first day of issue can become valuable historical artifacts. The practice began in the early 1900s and created an entire subculture of philatelic collecting focused on postal 'firsts.'
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