This is a Lock icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,000 icons, all in the same style and quality.
The image is the basic rounded outline of a padlock. The padlock has a U-shaped part sticking out the top where you would loop it through the thing your are locking. Currently it is in the locked position. In the middle of the main, round, body of the lock is a keyhole where the pins of the key would go in pointing down.
Related to Lock Icon
Related icons are the icons with matching tags, as well as all security icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors