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.
Micro USB vs Mini USB. USB or Universal Serial Bus connectors are one of the most common interfaces used in connecting peripherals to computers. First USB was developed as an industry standard in mid 1990`s by the coalition of vendor companies Compaq, DEC, IBM, Intel, Microsoft, NEC, and Nortel.