code: def is_moon(archar):
      """Checks for Arabic Moon letters.
      Moon Letters :
      @param archar: arabic unicode char
      @type archar: unicode
      @return:
      @rtype:Boolean
      """
      return archar in MOON
  
imports: import re
  from cltk.phonology.arb.utils.pyarabic import stack
label_desc: Use image node_id 16 for calling a global function with example usage: is_moon(archar) and returns: unknown