We have lots of signs in use to communicate various messages and alerts. Be it roadside signs for traffic and transport and alert signs for fire, danger etc. With these signs one gets the message without knowing about the language.
Free is a word often used in retail and products selling. Get Free stuff when you buy so and so item. Sometimes (or more often) there are conditions present. Free doesn’t have a symbol or sign associated with it. There should be a sign for word Free which should be used and people can easily identify the Free Offer message.
Free sign should be simple to draw and attention seeking. It would help sellers to get audience attention. Free stuff could come with and without conditions. There should be differentiation on Free sign. It could be color differentiation or shape differentiation (slight change in shape could be good). This differentiation could be adding a start * somewhere in sign image.
