This is Ideographs which are used to tell an idea faster without any words. To show/express ideographs you can use (<>). These angled brackets are also used by rhetorical critics. In short words ideographs are symbols to tell an idea without words. For example we know that a green sign with a arrow is telling us where is the exit. So is the hear.
A nice 140 icon set The icons are free to use for both personal and commercial use so feel free to download and share them. This icon set was designed and released by Rami McMin Download:http://graphicsbay.com/item/simple-outline-icons-justicons/77
In need of Free Education Icons? Check out this set we bring you today! This education icons set were inspired in our Color Line Icon set and it is available in 5 different sizes, 2 different styles (line and Color line) and vector files in Ai and SVG format.