Four symbols are like four pictures or signs that each stand for something different. For example, if you see an 'X', it could stand for 'wrong' or 'no'; if you see a heart, it could stand for 'love'; if you see a star, it could stand for 'good'; and if you see a triangle, it could stand for 'go'. So, four symbols are like four little pictures that are used to help us remember something or give us a clue about something.