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The knot (/nɒt/) is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.15078 mph. The ISO Standard symbol for the knot is kn. The same symbol is preferred by the Institute of Electrical and Electronics Engineers (IEEE); kt is also common.
Foot per second is unit of speed, its symbol is fps. It equals to 0.3048 meter per second or 60 feet per minute. Plural name is feet / second.