We wouldn’t forget “Earth Day” in our vast category of “holidays”. April 22 is a special day for us to reassess what we can do to help our planet. Smarty Symbols is filled with excellent vocabulary whether you are wanting to discuss the life of our planet (using our “plants”, “animals”, “birds”, “mammals” and “marine life”) or discuss the more abstract elements (using our “science”, “weather”, and “nature” categories); Smarty Symbols has the symbols you need for the simplest to the most complex words.