http://whatisacnc.com/pages/antenna/yagi.php

http://www.whatisacnc.com/pages/Antenna-Radio.PHP

Source: Arduino Basics: 433 MHz RF module with Arduino Tutorial 1

https://en.m.wikipedia.org/wiki/Dolby_Atmos

Source: How To Create Tabs

This will make h2 get 1., 2., h3 gets 1.1, 2.1, 2.2 etc…

<style>
   body{counter-reset: section}
   h2{counter-reset: sub-section}
   h3{counter-reset: composite}
   h4{counter-reset: detail}

   h2:before{
     counter-increment: section;
     content: counter(section) " ";
   }
   h3:before{
     counter-increment: sub-section;
     content: counter(section) "." counter(sub-section) " ";
   }
   h4:before{
     counter-increment: composite;
     content: counter(section) "." counter(sub-section) "." counter(composite) " ";
   }
   h5:before{
     counter-increment: detail;
     content: counter(section) "." counter(sub-section) "." counter(composite) "." counter(detail) " ";
   }
 </style>

Source: javascript – HTML / CSS autonumber headings? – Stack Overflow

https://en.m.wikipedia.org/wiki/Internet_Hall_of_Fame