New common error: invalid form submission character

Recently, you can often see a graphical button in the form of a curved arrow next to the site search field. Familiar captain O suggests: historically, one key of the keyboard is responsible, depending on the context, for entering, confirming, launching an action - in English “Enter”, or for a text operation: creating a new paragraph, breaking a line, in general, translating or typewriter carriage return - “Return”. This operation, and not the launch of the action, is symbolized by this icon. It seems to me that now, seeing similar icons on Big sites, many, without hesitation, simply copy.
Do not want to write on the button "Search"? Show the magnifying glass icon.
A couple of examples: Habrahabr , MyShows

- PS Standard request: minus one - specify the reason. Thank.
PS2 Transferred to iconography.