This part of IEC 62047 specifies descriptions of trench structure and needle structure in a micrometer scale. In addition, it provides examples of measurement for the geometry of both structures. For trench structures, this standard applies to structures with a depth of 1 ¼m to 100 ¼m; walls and trenches with respective widths of 5 ¼m to 150 ¼m; and aspect ratio of 0,0067 to 20. For needle structures, the standard applies to structures with a height, horizontal width and vertical width of 2 ¼m or larger, and with dimensions that fit inside a cube with sides of 100 ¼m. This standard is applicable to the structural design of MEMS and geometrical evaluation after MEMS processes.