You can see this icon in some aliments, now a days, it a appears in many of them. It means that the aliment it is writting in is gluten free, it doesn't contain gluten.
An other logo is the recycle one. It is made up from three arrows join together wanting to represent the three R . Recycle, Reuse and Reduce. The arrows want two express that every material can be use more than once, so recycle then.
It is a very common one wich we can see at everywhere where there is bin. It's color green is used to remember the idea of recycle so as to save the planet with green spaces.