The crossword solutions for the term TRIO NANNY are ENS, which stands for Ensign. Ensign is a junior rank of commissioned officer in the armed forces of some countries, especially in the navies of Commonwealth and Scandinavian countries. It is also used in the air forces of many countries. In the United States Navy, Ensign is the third-lowest rank and is equivalent to a second lieutenant in the other branches of the United States Armed Forces.