There are 4 division symbols that I have learned/taught. Below is 18 divided by 3, shown with 4 different symbols.
This question was sparked by the comments on my answer to the question on examples of mathematical slang. I wrote about the second symbol and it seemed that there were mathematical professionals who hadn't seen it before. I know that it was useful for teaching long division.
I am wondering when teachers introduce the 4 symbols in the US and other countries. I am also wondering the value of teaching each symbol.
Edit: To clarify, I was hoping for anecdotal evidence of when teachers introduce different symbols.