One possibility ... the abbreviation for Ångström, a unit of length, equal to 10-10 meter (or 10 nanometers), handy when writing the wavelength of things like infrared, visible, and ultraviolet light.
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If you mean the diameter of a circle with area pi, then the diameter is 2. If you mean the diameter of a circle with circumference pi, then the diameter is 2. If you mean the diameter of a circle with diameter pi, then the diameter is pi. If you mean the diameter of a circle with radius pi, then the diameter is 2pi.
What does it mean
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The letter or character used to represent the ratio of the circumference to the diameter of a circle is the Greek lower case letter π, called "pi."
Pi over 12 on a radian unit circle is a little more than a quarter of the circle. Radian units are an alternative to degrees.