Specify superscript and subscript in CAD
Specify superscript and subscript in CAD (write exponent in CAD, write special character in CAD). Many people wonder using which command to write Text in AutoCAD with superscript or subscript.
For example CaCO3
At this writing, we will introduce to you the way to write superscript and subscript in CAD as follows:
Command : MT ↵
If you want to write character above, you put exponent character (^) at the end.
For example 1: You want to write X with exponent 2, you do as follows:

If you want to write character below, you put exponent character (^) at the beginning.
For example 2: You want to write Na2SO4, you do as follows:

Then make color with blue the text you want to write exponent character, and press at key a/b on mtext tool bar.

The result for example 1:

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