It is often used in scientific terms related to the head, such as:
* Cephalic: Relating to the head.
* Cephalalgia: Headache.
* Cephalopod: A class of marine mollusks with heads and tentacles (e.g., squid, octopus).
* Cephalometry: The measurement of the head, particularly the skull.
* Cephalic index: A ratio of the head's width to its length, used to classify skull shapes.
Therefore, the prefix "ceph" generally refers to the head or something related to it.