\overset, \underset
\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
Sec. 5.9
of the WebTeX documentation.
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