So, I thought about what we had learnt at the last TOK class we had. Thinking back to last year (Year 11), I remember doing very similar exercies to the ones we did in class. Mr Sanderson (our past English teacher) would encourage us to pick a scene from a play (in that case it was Absent Friends) and make silent acting or still frames of the scene and have the rest of the class guess. We often used hand gestures (symbols) in order to convey something. For example, if the person had a fist held in front of the other charecter it could be used to represent confrontation and trouble between these two charecters.
Body gestures also fit into the symbol/sign rules as, you can use them to give the other person an idea of what you're trying to mean without having to say a single word. Someone nodding with their head will tell the other person they agree or that their saying "yes", a thumb held up can be interpreted as a sign of support, an eyebrow raised could mean confusion, and many other things can be held from this point. All in all, images and words (read) are taken in through the eyes and the sense of sight in order to fill in the blanks in case that words aren't available.
So, back to the actual pictorial symbols and signs, lately when going around the town I've been noticing more and more of these. Some of them aren't even too visible - not because their hidden, but because they seem so normal to our daily lifes that we alreadt overlook them and we immediately react upon seeing them. For instance, if someone sees a red traffic light flash on, it means that cars on the lane have to come to a halt to the the other cars pass. A green light means to advance and keep on going, and a yellow line means to have precaution when crossing. These are very common to people's lifes, but like always, people aren't born knowing - so indeed symbols and signs are created through agreement and passed down to newer generations by education depending on the place where this takes place.
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