Micro typically means a smaller form factor used for laptops. The amount of pins it has is 214.
A dimm (), often written as DIMM, commonly called a memory stick or RAM stick, comprises a series of dynamic random-access memory integrated circuits. These modules are mounted on a printed circuit board and designed for use in personal computers, workstations, printers, and servers. They are the predominant method for adding memory into a computer system. The vast majority of dimms are standardized through JEDEC standards, although there are proprietary dimms. Dimms come in a variety of speeds and sizes, but generally are one of two lengths PC which are 133.35 mm (5.25 in) and laptop (SO-DIMM) which are about half the size at 67.60 mm (2.66 in).