Ryan was the first person to express "there" with symbols. In an algebra book 1659, he used two symbols "∴" and "⊙" to mean "so", among which "∴" was used more. The English version of the book 1668 also uses these two symbols to mean "so", but "∵" is used more. Jones uses ∴ in 1706 to mean "so". By the middle of18th century, "∵" was used to mean "so", at least as much as "∴". "
/kloc-at the beginning of the 0/8th century, no one used ∵ to mean "because". It was not until 1805 that \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \ u \\ By 1827, Euclid's Elements of Geometry published by Cambridge University used ⊙ for "because" and ∴ for "so" respectively. This usage has become more and more popular and has been used ever since.