Meaning: [em] 
n. 1. the square of a body of any size of type 2. a linear unit (1/6 inch) used in printing.
n. 1. the square of a body of any size of type 2. a linear unit (1/6 inch) used in printing. 
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(121) An electromagnetism-like method (EM) is proposed for solving constrained optimizations on the basis of pattern search (PS).
(122) The EM Clamp is often used to test unshielded multiple conductor cables.
(123) The optimum distribution, which could let the EM wave focus inside the Fresnel zone, is given as well.