A semiotic square is a way of organizing ideas or symbols in order to compare them. It's like a big square with four sections. Each section has two words in it, like "good" and "bad" or "true" and "false". The four sections together create a bigger picture or idea. You can use a semiotic square to map out how different ideas or symbols relate to one another, or to compare two different sets of ideas. For example, you could use a semiotic square to map out how different animals are related to each other, or to show the differences between two different political parties.