An instrument only referred to in connection with the custom of boring the ear of a slave (Exodus 21:6; Deuteronomy 15:17), in token of his volunteering perpetual service when he might be free. (Comp. Psalm 40:6; Isaiah 50:5).

Noah Webster's New International Dictionary of the English Language

(n.) A pointed instrument for piercing small holes, as in leather or wood; used by shoemakers, saddlers, cabinetmakers, etc. The blade is differently shaped and pointed for different uses, as in the brad awl, saddler's awl, shoemaker's awl, etc.