This Siano 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 4,300 icons, all in the same style and quality.
A hay icon is a group of stick like objects that are bundled together. The hay icon has a pointy tip to show the pointy texture of hay. Another thing that the icon represents is that hay is pretty much always bundled or stuck together, and you would not see one piece of hay.