KC3 characters are U32 encoded Unicode codepoints. They have a litteral syntax enclosed in simple quotes, just like in C.
ikc3> '𐅀' '𐅀' ikc3> type('𐅀') Character ikc3> '🎳' '🎳' ikc3> '😄' '😄' ikc3> '🟣' '🟣' ikc3> '🤩' '🤩'