DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   descender
      <text> A lowercase letter that extends below the base line,
      such as "g", "j", or "p".  Also used to denote the part of the
      letter extending below the base line.  Compare ascender.
      (1998-03-27)