This is an image of a wine glass. The wine glass has a crack from the top rim going down into the middle. This is exactly like the image you would see on many boxes to indicate "fragile" or "breakable" items within.
This Fragile 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.