ren

noun3

1. •
   A kidney.

   • It would probably have been considered an important omission if I had not mentioned Water as a substance excreted freely by the renes or kidneys. — 1858
2. •
   One’s name, as part of the soul in ancient Egyptian mythology.

   • For the Ren did not belong to the man, but came out of the Celestial Waters to enter an infant in the hour of his birth and might not stir again until it was time to go back. — 1983
3. •
   (slang) A non-binary parent.

noun1

1. •
   Initialism of ringer equivalence number.