The crossword solution for the term SIGN OF SECRECY is VEIL, which is a four-letter word. A VEIL is a piece of cloth or other material that is used to cover or conceal something, often as a sign of secrecy. It is commonly used in religious ceremonies and in some cultures, it is worn by women as a symbol of modesty. Veils can also be used to protect the wearer from the elements or to hide their identity.