| | - Father's Day
- in the United States, holiday (third Sunday in June) to honour fathers. Credit for originating the holiday is generally given to Sonora Smart Dodd of Spokane, Washington, whose father, a Civil War veteran, raised her and her five siblings after ...
- fathom
- old English measure of length, now standardized at 6 feet (1.83 metre), which has long been used as a nautical unit of depth. The longest of many units derived from an anatomical measurement, the fathom originated as the distance from ...
- Fathometer
- trade name for a type of sonic depth finder (q.v.).
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