Diagram of relationships between derived SI units physics.nist.gov/cuu/Units/SIdi…

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In typography, a pica is 1/6 of an inch, and 12 points to a pica.

A fortnight is two weeks. It is a contraction of 'fourteen nights.'

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The name SI comes from French: Le Système international d'unités.

Leap seconds johndcook.com/blog/2020/02/0…

Informally, an astronomical unit is the distance from the Earth to the sun. Officially it is 149,597,870,700 meters.

Standard SI prefixes for factors of 10^6 and higher use upper case letters. Smaller factors and fractions use lower case letters.

An electron volt (eV) is the amount of energy gained by a charge of one electron moved across an electric potential difference of one volt.

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Units of measure in Middle Earth askmiddlearth.tumblr.com/post/994880830…

Standard SI prefixes are single Roman letters with two exceptions: the prefix for deca uses two letters, da, and the prefix for micro is μ.

A warhol is equal to 15 minutes of fame.

Converting between loudness units of phon and sone johndcook.com/phon_sone.html

A span is nine inches.

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The constant G in Newton's law of gravity is only known to between 3 and 4 significant figures. en.wikipedia.org/wiki/Gravitati…

A batman was a traditional unit of weight used in the Ottoman Empire, equal to about 17 pounds.

SI unit names are not capitalized, except for Celsius. Unit abbreviations are capitalized if and only if they units are named after people. So for example, Pascal is the man, pascal is the unit, and Pa is the abbreviation.