metre
['de Broglie wavelength', '<math xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="{\\displaystyle {\\mathsf {L}}}">\n  <semantics>\n    <mrow class="MJX-TeXAtom-ORD">\n      <mstyle displaystyle="true" scriptlevel="0">\n        <mrow class="MJX-TeXAtom-ORD">\n          <mrow class="MJX-TeXAtom-ORD">\n            <mi mathvariant="sans-serif">L</mi>\n          </mrow>\n        </mrow>\n      </mstyle>\n    </mrow>\n    <annotation encoding="application/x-tex">{\\displaystyle {\\mathsf {L}}}</annotation>\n  </semantics>\n</math>', '<math xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="{\\displaystyle \\lambda _{\\mathrm {C} }}">\n  <semantics>\n    <mrow class="MJX-TeXAtom-ORD">\n      <mstyle displaystyle="true" scriptlevel="0">\n        <msub>\n          <mi>&#x03BB;<!-- λ --></mi>\n          <mrow class="MJX-TeXAtom-ORD">\n            <mrow class="MJX-TeXAtom-ORD">\n              <mi mathvariant="normal">C</mi>\n            </mrow>\n          </mrow>\n        </msub>\n      </mstyle>\n    </mrow>\n    <annotation encoding="application/x-tex">{\\displaystyle \\lambda _{\\mathrm {C} }}</annotation>\n  </semantics>\n</math>', 'metre', '<math xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="{\\displaystyle \\lambda _{\\mathrm {C} }={\\frac {h}{mc_{0}}}}">\n  <semantics>\n    <mrow class="MJX-TeXAtom-ORD">\n      <mstyle displaystyle="true" scriptlevel="0">\n        <msub>\n          <mi>&#x03BB;<!-- λ --></mi>\n          <mrow class="MJX-TeXAtom-ORD">\n            <mrow class="MJX-TeXAtom-ORD">\n              <mi mathvariant="normal">C</mi>\n            </mrow>\n          </mrow>\n        </msub>\n        <mo>=</mo>\n        <mrow class="MJX-TeXAtom-ORD">\n          <mfrac>\n            <mi>h</mi>\n            <mrow>\n              <mi>m</mi>\n              <msub>\n                <mi>c</mi>\n                <mrow class="MJX-TeXAtom-ORD">\n                  <mn>0</mn>\n                </mrow>\n              </msub>\n            </mrow>\n          </mfrac>\n        </mrow>\n      </mstyle>\n    </mrow>\n    <annotation encoding="application/x-tex">{\\displaystyle \\lambda _{\\mathrm {C} }={\\frac {h}{mc_{0}}}}</annotation>\n  </semantics>\n</math>', 'ISO 80000-10:2019 Quantities and units — Part 10: Atomic and nuclear physics', 'WikiProject Mathematics', ' <math xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="{\\displaystyle h}">\n  <semantics>\n    <mrow class="MJX-TeXAtom-ORD">\n      <mstyle displaystyle="true" scriptlevel="0">\n        <mi>h</mi>\n      </mstyle>\n    </mrow>\n    <annotation encoding="application/x-tex">{\\displaystyle h}</annotation>\n  </semantics>\n</math>', '?']