The term 'NORMAL OPENING' can be summarized as a four letter word, 'PARA'. This term is used in the military to refer to an OPENING in a formation or line of troops. It is typically used when a unit needs to move through a formation without disrupting it. The NORMAL OPENING is usually wide enough for two people to pass through side-by-side. This type of OPENING is also used in sports such as football and rugby, where players need to move through a line of defenders without being tackled.