All the signs in the article are listed as "Public domain". Edit: this is discussed on https://graphicdesign.stackexchange.com/questions/8586/can-i-freely-use-

All the signs in the article are listed as "Public domain". Edit: this is discussed on https://graphicdesign.stackexchange.com/questions/8586/can-i-freely-use-the-fire-exit-symbol-and-similar-iso-symbols https://graphicdesign.stackexchange.com/questions/8586/can-i...