Because they represent a well-known concept in category theory and symbols are a simple, uniform way of representing that concept. It's terminology. Math has te

Because they represent a well-known concept in category theory and symbols are a simple, uniform way of representing that concept. It's terminology. Math has terminology and so does category theory. Should we write (3 multiplied by 2 added to 5) in math? No. We write 3 * 2 + 5. Once you know those symbols, they're well understood and concise.