PNG SVG PSD EPS MORE
Signs
Flat
Essentials
Add, sign, signs
Black
512x512
Coolicons
more, Cool Icons, symbols
Cool Icons, plus, more
Font Awesome
signs, square, rounded
shapes
iOS7 Premium Fill
Options, shapes, Circular
Interface
more, Add, button
plus, signs, more
other
maths, mark, more
Add, more, cross
Typicons
plus, operation, more
technology
Entypo
Add, maths, addition
Ampersand, more, And
technology, Add, more