The term 'CROSS IN HIEROGLYPHICS' can be represented by the four-letter solution 'ANKH'. ANKH is an ancient Egyptian hieroglyphic symbol that represents the concept of eternal life. It is often depicted as a cross with a loop at the top, and is believed to have originated from the Egyptian god of life, Osiris. The ANKH is also known as the key of life, and is used as a symbol of protection and good luck.