warning sign for industrial. caution and warning label for keep door closed.

font text brand line diagram presentation advertising logo document label signage banner number cartoon sign circle handwriting warning industrial caution door closed form open crossed red indicates always close security reasons accident alarm alert attention banner beware careful carefully caution closed cross danger dangerous door entrance entry exclamation exit gate harmful hazard health icon industrial industry information isolated label mark message notice personal protective precaution prohibition protect protection risk safety secure security sign sticker stop symbol vector warn zone