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
Using ALT codes. Find the symbol or letter that you want to type by using an ASCII chart (see resources). Find the corresponding ALT key for the character you want to type. Hold down the ALT button on your keyboard followed by the ALT code using the number pad on the right your keyboard.