PNG MORE
Mixed
Pixel
Koloria icons pack
school, Book
SandyBrown
28x32
PNG ICO ICNS MORE
Computer & hardware
WooCons #1
Board, chalkboard, school
DimGray
32x32
Travel & hotels
Google Maps Icons
school
DarkSlateGray
32x37
school, university
UI
Gnome icons
Black board, teaching, learn
Black
48x48