Arturo was influenced by Rebol which comes with LOOP - http://www.rebol.com/r3/docs/functions/loop.html

However there are some differences...

  loop 10 [
      print "hello"   ;; prints "hello" 10 times
  ]

  repeat n 10 [
      print n         ;; prints 1 to 10
  ]

  forever [
     print "hello"    ;; print "hello" forever!
  ]