Idea of Header 3 Icon
The icon comprises of a pair of empty block letters, a capital H and a 3. The icon represents the third level of header within an HTML document, below two layers of header, H2 and H1. This header level is typically used to represent sub-sub-sections of a document.
This Header 3 icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,100 icons, all in the same style and quality.