Thing is a bodyless hand who is The Addams Family's servant. He communicates to the Addamses through sign language. In the original series especially he seems to be able to appear through a drawer or box at any given time and give any of the Addams items (mail, tissues etc.) that they seem to need at that moment. Later in the films along with using sign language to communicate also uses morse code.
September 15, 2021: Volume LXXXIX, No 18 by Kirkus Reviews - Issuu
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