what is the symbol where one small slash is next to a bigger slash?

That’s usually the forward slash : /. It’s the common slanted line used in dates, fractions, URLs, and “or” forms like and/or.

If you meant a slash that looks a bit different in math or typography, it could also be one of these:

• Fraction slash : ⁄
• Division slash : ∕
• Backslash : \

A quick example:

• 3/4 = forward slash.
• 3⁄4 = fraction slash.

If you want, I can help identify the exact symbol from a screenshot or by its keyboard code.