The TAU is a mathematical constant and it is the alias of TWO_PI. The value of TAU is 6.28318530717958647693. It is twice the ratio of the circumference of a circle to its diameter.
Below program illustrates the usage of TAU in p5.js:
Example: This example illustrates the TAU constant.
stroke(255, 204, 0);
arc(180, 50, 280, 280, 0, TAU/2);
"Value of TAU is "
+ TAU, 30, 230);