Overset and Underset

`\overset, \underset`

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\overset{a}{B} + \underset{e}{E}

\overset{\overset{o}{Q}}{N} \quad

\underset{\underset{\underset{o}{x}}{Q}}{(x^2-y^2)}  \quad

\overset{n\,\, \text{terms}}{\overbrace{1 + 2 + 3 + \cdots + n}}

More information on these commands may be found in Mathematical Expressions: Placing symbols over or under an expression of the WebTeX documentation.