It’s a padlock. The bottom is square with rounded edges. Inside the square is four filled in circles in a line from the left to the right. On top of the square is an eclipse shape symbolizing the hooped part of the lock.
This Password icon is made in flat color style
. This format was developed by Icons8 designer team and became immensely popular for use in web and mobile applications. Feel free to download this icon in PNG format for free, or unlock other formats for $5. Unlike other icon packs that have merely hundreds of icons, this monster icon pack contains 5,900 icons, all in the same style and quality.