Knot is a unit of speed which of following?

Explanation: A knot is a specialized non-SI unit utilized internationally for measuring speed in maritime navigation and meteorology/aviation.

### Important Facts:
* **Value:** One knot is equal to **one nautical mile per hour**, which translates to exactly **1.852 km/h** (approx. 1.15 mph).
* **Historical Origin:** Sailors used to throw a log tied to a knotted rope into the sea. They counted how many knots passed through their hands in a set time period (measured with an hourglass).
* **Primary Application:** Standardized unit for ships, boats, submarines, and aircraft velocity.