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.
Type A and Type B Ports. All USB devices have sockets, and all the cables have plugs. Host sockets are Type A, and peripheral sockets are B, Mini-B or Micro-B. For expansion, hubs have a B or Mini-B socket to connect to the computer and several Type A sockets for devices (see USB hub).