The measurement quoted in dB describes the ratio (10 log power difference, 20 log voltage difference, etc.) between the quantity of two levels, the level being measured and a reference.
Alt Codes for Bracketing ; Alt Code Symbol Description Alt 40 ( Open Bracket Alt 41 ) Close Bracked Alt Codes for Degree of Accuracy ; Alt Code Symbol Description Alt 241 Â± Plus or Minus Alt Codes for Fractions ; Alt Code Symbol Description Alt 47 / Fraction seperator
With the Windows update, it is now possible to use alt code text entry to obtain the Indian Rupee symbol - Alt 8377. (as of May 2012, testing this alt-code (Windows 7, MS Office 2010, and Canadian Multilingual Keyboard): it works fine in MS Word, MS OneNote, and MS Outlook.