Bible Encyclopedias
Apex

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

a stitched cap, somewhat resembling a helmet, with the addition of a little stick fixed on the top, and wound about with white wool, properly belonging to the ancient Flamen (q.v.)'.

The word is also used by Jerome to express a small hair-stroke, with which the Jews embellish the top of some of the Hebrew characters, placing it over them in the shape of a crown. These are used especially in the books read in the synagogues, and in the Mezuzzoth (q.v.).

Bibliography Information
McClintock, John. Strong, James. Entry for 'Apex'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/​encyclopedias/​eng/​tce/​a/apex.html. Harper & Brothers. New York. 1870.