wave line and wavy zigzag pattern lines. black underlines, smooth end squiggly curvy squiggles

amplitude angular bent billow black corrugated crisscross curvature curve curvy divider edge edgy element end equalizer flex frame graphic horizontal isolated jagged line lines outline parallel pattern ripple round set sharp sine sinus smooth spring squiggle squiggles squiggly stitch template underline underlines undulate vector wave waveform wavy white wiggle wiggly winding wriggle wriggly zigzag