The meaning of three dots in a triangle?
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". While it is not generally used in formal writing, it is used in mathematics and shorthand. 
What is the meaning of three dots in an upright triangle?
therefore
Therefore sign
The inverted form ∵, known as the because sign, is sometimes used as a shorthand form of "because".
What is the meaning of three dots in an inverted triangle?
because
Therefore sign
Therefore sign
https://en.wikipedia.org/wiki/Therefore%20sign
In meteorology, the 'therefore' sign is used to indicate 'moderate rain' on a station model
Therefore sign
In Freemasonry traditions, the symbol is used to indicate a Masonic abbreviation
Therefore sign
In logical argument and mathematical proof, the therefore sign, three dots placed in an upright triangle, means the word therefore. The therefore sign is generally used before a logical consequence, such as the conclusion of a syllogism. While it is not generally used in formal writing, the therefore sign is used in mathematics and shorthand. In meteorology, the therefore sign is used to indicate moderate rain on a station model. In Freemasonry traditions, the therefore sign is used to indicate a Masonic abbreviation. The inverted form of the therefore sign, the because sign, is sometimes used as a shorthand form of the word because. 