Lol "squiggle." I can't think of anything better either.

Maybe the stroke would look better with butt-style ends? Like this:

I have some improvements to the squiggle, but unfortunately, I have no internet in my house except on my phone until the 27th.

basically, I

• made a rectangle
• gave it a stroke
• shrunk the height to fit in the 12x3 area under the U
• used the function plotter to generate a sine wave
  • adjusted the width and function x/y parameters of the function plotter until I got exactly the right length from the low point (left) to the high point (right)
• converted the stroke to a path
• cut it at the low point (left)/high point (right)
• simplified the path

this probably could have been simpler

16px

In D24185#537365, @ndavis wrote:

I have some improvements to the squiggle, but unfortunately, I have no internet in my house except on my phone until the 27th.

basically, I

• made a rectangle
• gave it a stroke
• shrunk the height to fit in the 12x3 area under the U
• used the function plotter to generate a sine wave
  • adjusted the width and function x/y parameters of the function plotter until I got exactly the right length from the low point (left) to the high point (right)
• converted the stroke to a path
• cut it at the low point (left)/high point (right)
• simplified the path
  
  this probably could have been simpler

I tried to do this with a Sine wave, but I couldn't get it to generate a fitting wave, so I guess I abandoned that approach prematurely. I'll try again with some of your parameters.

Now the butt ends are gone again. :)

In D24185#537880, @ngraham wrote:

Now the butt ends are gone again. :)

Yes, I think it makes more sense for this underline to be a visual crop of a longer one as they would appear in eg. LibreOffice Writer. It should also make for a tiny bit more contrast at the ends at 100%