<?xml version="1.0" encoding="UTF-8"?>

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mtext>Inline double down arrows, display style, thick line </mtext> 
  <mstyle displaystyle="false" scriptlevel="0">
    <mrow>
      <mo form="prefix" fence="true" stretchy="true" lspace="0em" rspace="0em">&#x021D3;</mo> 
      <mrow>
        <mstyle displaystyle="true" scriptlevel="0">
          <mfrac linethickness="1pt">
            <mrow>
              <mi mathcolor="gray">sin</mi> 
              <mo rspace="verythinmathspace">&#x02061;</mo> 
              <mi>&#x003B8;</mi> 
            </mrow> 
            <mi>M</mi> 
          </mfrac> 
        </mstyle> 
      </mrow> 
      <mo form="postfix" fence="true" stretchy="true" lspace="0em" rspace="0em">&#x021D3;</mo> 
    </mrow> 
  </mstyle> 
  <mtext> the end.</mtext> </math>