Therefore sign specialized keyboards and fonts, and to prevent compatibility issues, it's often substituted by a colon followed by a period (":.") even if it's considered more elegant to use the original therefore character in printing. Therefore sign In logical argument and mathematical proof, the therefore sign (∴) is generally used before a logical consequence, such as the conclusion of a syllogism. The symbol consists of three dots placed in an upright triangle and is read "therefore". It is encoded at . For common use in Microsoft Office hold the ALT key and type "8756". While it is not generally used in
Wythoff symbol and formula_7, represent the corners of the Schwarz triangle used in the construction, which are formula_8, formula_9 and formula_10 radians respectively. The triangle is also represented with the same numbers, written formula_11. The vertical bar in the symbol specifies a categorical position of the generator point within the fundamental triangle according to the following: In this notation the mirrors are labeled by the reflection-order of the opposite vertex. The formula_18 values are listed "before" the bar if the corresponding mirror is active. The one "impossible" symbol formula_19 implies the generator point is on all mirrors, which is only possible if