Green triangles with symbolic characters.
Vista by Kudesnick - Triangles Icons
Here is another icon set that I have created. The icon templates are originally designed by Kudesnick. All the credit goes to him for creating those templates on the icon composer section of the RealWorld website.
There are 15 green triangular icons. The triangle has no symbol, whilst all the other have symbols associated to them. The associated tags for this icon set is "Triangular" and "Green".