This particular icon set falls into the “window” category. Nothing to do with “Windows” the operating system, but the adjustment of windows, panes, and closure icons.
Have a play around, they’re free , and you can do whatever you want with them.
Website: http://www.gosquared.com/liquidicity/
Download AI: http://www.gosquared.com/images/help_sheets/Window_Icons_01.ai
Download SVG: http://www.gosquared.com/images/help_sheets/Window_Icons_01.svg
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