The term 'Battle Sign' is a term used to describe a type of communication used by soldiers in battle. It is also known as a 'SCAR', which is a four letter word that can be used to solve the crossword. Battle Sign is a form of non-verbal communication used by soldiers in order to communicate with each other without alerting the enemy. It is usually done by making hand signals or using flags. This type of communication is still used today by military personnel in order to coordinate and execute strategies during battle.