It is a small leaf inside of a lightbulb. The tip of the leaf is near the top of the lightbulb and the stem of the leaf reaches down to the bottom of the bulb.
This Greentech icon has Android KitKat style
. If you use the icons for Android apps, we recommend using our latest Material Icons icon pack (please check our sidebar on the right). Otherwise, it's a solid icon pack that looks good in small resolutions, either on the web or in print. It's characterized by thick lines, smooth corners, and is optimized for 24x24 pixels.