device used to control friction when descending a climbing line (contrast with ascender).

Merriam-Webster Online Dictionary
descender (noun)
the part of a lowercase letter (as p) that below the main body of the letter - descends , also a letter that has such a part
descender (Wikipedia)
Descenders are parts of a character that lie below the baseline.

In typography, a descender is the portion of a letter that extends below the baseline of a font. The line that descenders reach down to is known as the beard line.

For example, in the letter y, the descender is the "tail", or that portion of the diagonal line which lies below the v created by the two lines converging. In the letter p, it is the stem reaching down past the o.

In most fonts, descenders are reserved for lowercase characters such as g, j, q, p, y, and sometimes f. Some fonts, however, also use descenders for some numerals (typically 3, 4, 5, 7, and 9). Such numerals are called old-style numerals. (Some italic fonts, such as Computer Modern italic, put a descender on the numeral 4 but not on any other numerals. Such fonts are not considered old-style.) Some fonts also use descenders for the tails on a few uppercase letters such as J and Q.

The parts of characters that extend above the x-height of a font are called ascenders.

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