Rnd

Return a random number

Syntax 
      Rnd[(seed)]

Key
   seed  A seed value of 0 will return the most recent random number
         A seed value > 0 will return the next random number(default)
         A seed value < 0 will return the same number

Example

  myrand = rnd()
  WScript.Echo myrand

“Find the seed at the bottom of your heart and bring forth a flower” - Shigenori Kameoka

Related:

Randomize(number) - Initialise the random number generator
Equivalent Powershell command:
$objRand = new-object random
$num = $objRand.next(1,500)