SUP is for superscripts

sup

The "sup" element is for treating a character as a superscript, displaying it in a smaller text than its surrounding text, and raising its typographic baseline.

Examples

area      A = π r2                A = π r<<sup 2>> 

sum ∑ = x0 + x1 + x2 + ... ∑ = x<<sup 0>> + x<<sup 1>> + x<<sup 2>> + ...

ordinals 1st, 2nd, 3rd, 4th 1<<sup st>>, 2<<sup nd>>, 3<<sup rd>>, 4<<sup th>>

one-fifth 1/5 <<sup 1>>/<<sub 5>>
The sup element

semantax > term-mark > supSUP is for superscripts

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