descender

noun5

1. •
   A person or thing that descends.
2. •
   The part of a letter or number that is drawn below the baseline (the bottom of most lowercase letters).
3. •
   A cyclist who excels at fast descents.
4. •
   A belay device used in rock climbing, or as a fire escape.
5. •
   A letter that has such a portion, such as g, j, or in some fonts Q.