Power Button Symbols in Multiple Colors

Here are three distinct power button symbols. Two of them glow, one in a cool blue and the other in a bright green, suggesting active or 'on' states. The third button is a dark grey, implying an 'off' or standby status. All are presented as sleek, square icons with glossy, rounded corners, ideal for interface elements.

power button - on off - icon - symbol - control - interface - device status