<p>A Cornu spiral, produced by a parametric plot of the <a href="https://en.wikipedia.org/wiki/Fresnel_integrals" class="extiw" title="w:Fresnel integrals">Fresnel integrals</a>:
<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle (x,y)=(C(t),S(t))\,}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mo stretchy="false">(</mo><mi>x</mi><mo>,</mo><mi>y</mi><mo stretchy="false">)</mo><mo>=</mo><mo stretchy="false">(</mo><mi>C</mi><mo stretchy="false">(</mo><mi>t</mi><mo stretchy="false">)</mo><mo>,</mo><mi>S</mi><mo stretchy="false">(</mo><mi>t</mi><mo stretchy="false">)</mo><mo stretchy="false">)</mo><mspace width="thinmathspace"></mspace></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle (x,y)=(C(t),S(t))\,}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1e4b181a655ae53de05ae37f500232d0459bca3c" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.838ex; width:20.221ex; height:2.843ex;" alt="{\displaystyle (x,y)=(C(t),S(t))\,}"></span>
</p>
where <i>t</i> runs from -7 (bottom left) to 7 (top right). The function converges to the points shown as <i>t</i> tends to positive or negative infinity.
<a href="//commons.wikimedia.org/wiki/User:Inductiveload" title="User:Inductiveload">Inductiveload</a>
<span class="int-own-work" lang="en">Own work</span> (<span lang="en" dir="ltr">Original text: <i><bdi lang="">self-made, Mathematica and Inkscape</bdi></i></span>)