piece of gear that enables a climber to ascend a rope. Attached to the rope. it will grip in one direction (down) and slide in the other (up) (contrast with descender).

Merriam-Webster Online Dictionary
ascender (noun)
the part of a lowercase letter (as b) that rises above the main body of the letter , also a letter that has such a part
a device used for climbing rope that slides freely in one direction and grips the rope when pulled in the opposite direction
ascender (Wikipedia)

Ascender may refer to:

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