It's often used in biological terms to refer to digits or toes. For example:
* Pentadactyl: Having five fingers or toes (like most mammals).
* Tetradactyl: Having four fingers or toes.
* Didactyl: Having two fingers or toes.
However, "-dactyl" can also appear in other contexts, like:
* Dactylography: The study of fingerprints.
* Dactyloscopy: The identification of individuals by their fingerprints.
In all cases, the suffix "-dactyl" relates back to the concept of fingers.