diesis

from WordNet (r) 3.0 (2006)

diesis
    n 1: a character used in printing to indicate a cross reference
         or footnote [syn: {double dagger}, {double obelisk},
         {diesis}]

from The Collaborative International Dictionary of English v.0.48

Diesis \Di"e*sis\, n.; pl. {Dieses}. [NL., fr. Gr. ?, fr. ? to
   let go through, dissolve; dia` through + ? to let go, send.]
   1. (Mus.) A small interval, less than any in actual practice,
      but used in the mathematical calculation of intervals.
      [1913 Webster]

   2. (Print.) The mark [dag]; -- called also {double dagger}.
      It is used in printing to indicate a cross reference or
      footnote

   Syn: double obelisk.
        [1913 Webster]