The term 'Happy Face Symbols' is commonly referred to as 'Smileys'. Smileys are a type of ideogram used to express emotions in digital communication. They are often represented by a combination of punctuation marks, letters, and symbols, such as a colon and parentheses. The use of smileys has become increasingly popular in recent years, and they are now widely used in text messages, emails, and other forms of digital communication.