"Sharia" is the Arabic word for "law", so "Sharia law" just means "law law", or at least "law in places that speak Arabic" which is at least a little bit specific.

Sharia law actually has some good ideas in it. I think we should investigate Islamic banking and see if any of it would improve our economies. Because charging interest is forbidden in Islam, many of them do mortgages as a rent to own system instead, which leaves the bank on the hook if the house value crashes, instead of the buyer, so banks don't give out stupidly big mortgages that you might not want to pay back.