Idea of Fill Color Icon
This looks like a square turned on its side, like a diamond. There is a handle connected to the square, and liquid is dripping out of it.
This Fill Color icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.