If you’re looking for Space Iconography Free Icons then have a look at this icons set. This is collection of 36 neatly designed icons inspired by celestial bodies and other various space elements. Download it for free and add to your freebie collection right now!
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.