Printer's measure is a system of units used in the printing industry to measure type size and line length. The four solutions for this term are PICA (4 letters), ENS (3 letters), EM (2 letters), and EMS (3 letters). PICA stands for 'PICA EM', which is a unit of measurement equal to 12 points, or 1/6 of an inch. ENS stands for 'EN', which is a unit of measurement equal to half of a PICA. EM is an abbreviation for 'EM quad', which is a unit of measurement equal to one square EM. EMS stands for 'EM space', which is a unit of measurement equal to one EM.