title: How to make icon same/similar physical size on range of different devices?
body: <p>I've got a problem that has me really stumped. But it seems like it must be a common issue nowadays, I'm surprised I couldn't find another question about it.</p>
  
  <p>Basically, I have icons that appear on my site. I want them to appear about the same size - roughly a touchable size - on every device. From an old cheap 2.3 Samsung to a new high 2560x1440 high res display, I want these icons to be about 1.5" across. A similar size on tablets, on computers, etc.</p>
  
  <p>What would be a reasonable approach to figuring this out, without for instance making a complex table of a whole range of devices and screen sizes?</p>