Links of Icons from w3schools.com

Source/Reference:
https://www.w3schools.com/icons/default.asp

Icons Tutorial

• Icons HOME
• Icons Reference

Font Awesome

• Font Awesome Intro
• Icons Brand
• Icons Chart
• Icons Currency
• Icons Directional
• Icons File Type
• Icons Form
• Icons Gender
• Icons Hand
• Icons Medical
• Icons Payment
• Icons Spinner
• Icons Text
• Icons Transportation
• Icons Video
• Icons Web Application

Bootstrap

• Icons BS Glyphicons

Google

• Google Icons Intro
• Icons Action
• Icons Alert
• Icons AV
• Icons Communication
• Icons Content
• Icons Device
• Icons Editor
• Icons File
• Icons Hardware
• Icons Image
• Icons Maps
• Icons Navigation
• Icons Notification
• Icons Places
• Icons Social
• Icons Toggle