Nautical League
A nautical league is a unit of distance once used at sea, mainly by sailors and navigators. It equals 3 nautical miles, which is about 5.56 kilometers or 3.45 miles. Nautical leagues were used to measure longer distances during voyages before modern navigation tools became common. While the nautical mile is still widely used today in maritime and aviation navigation, the nautical league is mostly obsolete and rarely used.
Microinch
A microinch is a very small unit of length used primarily in precision engineering and manufacturing. It equals one-millionth of an inch (0.000001 inch), which is approximately 0.0254 micrometers (µm).
Microinches are used to measure extremely fine tolerances, surface finishes, and thicknesses in high-precision machining, electronics, and materials science.
Key facts:
1 microinch = 0.000001 inch
1 microinch ≈ 0.0254 micrometers (µm)
Used in precision engineering for very small measurements
Allows for accurate description of surface roughness and thickness
The microinch is essential in fields requiring ultra-fine measurements where standard units like the inch or millimeter are too large.