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
How to Use ASCII Code: 1  Press the Alt key on the keyboard. 2  While holding the Alt key, type the number of the symbol that is desired. 3  For example, an e with an accent () has the code number 130. 4  To get this character, simply hold Alt and type 130. 5  Let go of the Alt key once the character has been accessed.