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Mathematical symbols, such as "6" written backwards, don't seem to be Greek letters. How to fight?
Taking the sogou input method as an example, the input method of the anti-6 symbol ""is as follows:

Step 1: Open the sogou input method and right-click the display box.

Step 2: After displaying the list menu, click Symbol Set in Symbol Expression.

Step 3: After the dialog box pops up, select the "Mathematics/Unit" option on the left, find the ""(Calculus) symbol in the list on the right, and click with the mouse to insert it at the specified location.