When exploring and analyzing data, we may need to add colored icons to help us visually identify patterns and trends. Currently, there are two main ways to add icons.  
1. Icon sets for conditional formatting 
a) built-in icon sets 
b) custom icon sets (json file of theme) 
2. Conditional fields 
a) SVG xml, Img URL, Built-in icon name 
b) Html-code of Unicode characters