PNG ICO ICNS MORE
Wireframe Mono
Checkbox, unchecked
Black
48x48
PNG ICO MORE
Gnome 2.18 Icon Theme
Form, ok, yes
24x24
PNG ICO ICNS SVG MORE
Mixed
Glyph
Glypho - Free
Edit, Checkbox, pencil
512x512
Gaming & gambling
Photorealistic
48x48 Free Object Icons
banner, Black, flag
pennant, small flag, Checkbox
small flag, ensign, Blue
flag, small flag, flags
ensign, usa, flag
IcoMoon
Checked, Checkbox
32x32
partial, Checkbox
unchecked, Checkbox
Business & finance
Wireframe mono icons
Checkbox, Checked, unchecked
UI
Pixel
Gnome icons
tick, Checkbox, Form