javascript – has another suffix that does the same thing as quotation mark?

I was testing a security system from a frind website, and I came across a curious XSS security system, it consists of: in every quote, it put a slash in the code, I’m curious if there is any other character that replaces the quote.
i will place an example:
i place that:<script>var alertxss="xss test"; alert(data)</script>

and when i execute the XSS, the site saves the code like this:<script>var alertxss="xss test"; alert(data)</script>