Pi Times

is a monadic scalar function which gives the argument times the mathematical constant pi $$\pi$$. Its glyph, which is shared with the dyadic arithmetic function Circular, alludes to pi being the ratio of a circle's circumference to its diameter. The phrase "some value times $$\pi$$" appears frequently in mathematical formulas related to a circle or trigonometric functions while $$\pi$$ raised to some power is rare, which explains the design decision behind this function.



Examples
The value of $$\pi$$ can be obtained by giving the argument of 1.

As a pun,  is often called apple pie, jokingly using an unconventional pronunciation of the name APL in conjunction with the homophones pi/pie.

Documentation

 * Dyalog
 * APLX
 * J Dictionary, NuVoc