`sum` (ternary)

Sum

AsciiMath

sum_(x)^(y) z

LaTeX

\sum_{x}^{y} z

MathML

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mstyle displaystyle="true">
    <mrow>
      <munderover>
        <mo>&#x2211;</mo>
        <mi>x</mi>
        <mi>y</mi>
      </munderover>
      <mi>z</mi>
    </mrow>
  </mstyle>
</math>

OMML

<m:oMathPara>
  <m:oMath>
    <m:nary>
      <m:naryPr>
        <m:chr m:val="∑"/>
        <m:limLoc m:val="undOvr"/>
        <m:subHide m:val="0"/>
        <m:supHide m:val="0"/>
      </m:naryPr>
      <m:sub>
        <m:r>
          <m:t>x</m:t>
        </m:r>
      </m:sub>
      <m:sup>
        <m:r>
          <m:t>y</m:t>
        </m:r>
      </m:sup>
      <m:e>
        <m:r>
          <m:t>z</m:t>
        </m:r>
      </m:e>
    </m:nary>
  </m:oMath>
</m:oMathPara>

UnicodeMath

∑_(x)^(y)▒〖z〗