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.
The major difference between an SD memory card and a micro SD memory card is its size. A regular SD memory card is approximately an inch in diameter, where as a micro SD memoâ¦ry card is half its size to fit into digital cameras and phones.