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Can I use the math symbol seven because of it?
You can use it.

Because the math teacher in the first volume of the seventh grade will explain, for the convenience of teaching, children are allowed to use symbols because of it and use them when doing problems.

1998, the national standard abolished the ∵ and ∴ symbols and replaced them with Chinese characters, because. Some older middle school teachers may not care about these and continue to use them.