A neato, animated squiggly line that could repeat horizontally.

squiggly-line.svg

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ev="http://www.w3.org/2001/xml-events" viewBox="0 0 20 4">

    <path fill="none" stroke="#000000" stroke-width="1" class="st0" d="M0,3.5 c 5,0, 5, -3, 10, -3 s 5,3, 10, 3 c 5,0, 5, -3, 10, -3 s 5,3, 10, 3"/>

        <style type="text/css">
        .st0 {
            animation: shift 0.3s linear infinite;
        }
        @keyframes shift {
            from {
                transform: translateX(0);
            }
            to {
                transform: translateX(-20px);
            }
        }
        @media (prefers-reduced-motion: reduce) {
          .st0 {
            animation: none;
          }
        }
        </style>
</svg>