Service mark symbol. The service mark symbol (â ), the letters SM in superscript style) is a symbol used in the United States to provide notice that the preceding mark is a service mark.
Size matters: The micro and mini USB connectors are of similar width. But the micro connector is much thinner (smaller vertical dimension). Some product designs were not able to accommodate the height of the mini receptacle and the new thinner receptacle will encourage and allow thinner products.
Both SIM card has the same contact arrangement. The difference is only in size of the SIM card. A mini SIM has a size of 15 mm x 25 mm whereas micro SIM has 12 mm x 15 mm having same thickness. Written Jun 20, 2015.