You will come across and use these UI symbols frequently in your daily life. You exactly can remember what each of these symbols are meant for but have you ever thought of how each of these symbols originated. This infographic done in colloboration between 500startups and visual.ly gives you this information. The information on this infographics has been actually taken by a 2010 article on wired.com.
Click here for the Large version of this infographics.