A title given to serjeants at law, who are called "serjeants of the coif," from the coif they wear on their heads. The use of this coif at first was to cover the clerical tonsure, many of the practising serjeants be- ing clergymen who had abandoned their pro- fession. It was a thin linen cover, gathered together in the form of a skull or helmet; the material being afterwards changed into white silk, and the form eventually into the black patch at the top of the forensic wig, which is now the distinguishing mark of the degree of serjeant at law. (Cowell; Foss, Judg.; 3 Steph. Comm. 272, note.) Brown. COIN, v. To fashion pieces of metal into a prescribed shape, weight, and degree of fineness, and stamp them with prescribed devices, by authority of government, in or- der that they may circulate as money. See 2 Duv. 29; 22 Ind. 306; 25 How. Pr. 105. COIN, n. Pieces of gold, silver, or other metal, fashioned into a prescribed shape, weight, and degree of fineness, and stamped, by authority of government, with certain marks and devices, and put into circulation as money at a fixed value. Strictly speaking, coin differs from money, as the species differs from the genus. Money is any matter, whether metal, paper, beads, shells, etc., which has currency as a medium in commerce. Coin is a particular species, always made of metal, and struck according to a certain process called "coinage." Wharton.