nina

noun1

1. •
   A hidden message revealed in the completed grid of a crossword.

   • Ninas may or may not be present and, even if one is there, it can go unnoticed because, not being intrinsic to the solution, its presence is not advertised—or because it is so well hidden. — 2014

noun1

1. •
   A NINA loan.

phrase1

1. •
   (historical) Initialism of no Irish need apply (in job advertisements).