The symbol for feet is one apostrophe, as in 15 feet = 15'
The symbol for inches is two apostrophes, as in 15 inches = 15"
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The symbol '''' typically stands for feet in measurements of length. In the context of imperial units, one foot is equal to 12 inches. It is often used in construction, architecture, and various fields where precise measurements are required.
It is the symbol for an Angstrom, a unit of length equal to 0.1 nanometer or 1*10-10 metres. It is often used in the context of wavelengths of visible light.
pentacle is like a pentagram, pentagon is a different shape like the old Chrysler symbol 5 equal length sides at 108 degrees precisely
There are many: pi (or π); f or h for frequency (h is for Hertz, the unit for freq); l for the wavelength (lambda = l for length); t for time.