Clerical tonsure
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
The having the head shaven, which was formerly peculiar to clerks, or persons in orders, and which the coifs worn by Serjeants at law are supposed to have been introduced to conceal.
1 Bl. Comm. 24, note t; 4 Bl. Comm. 307.