What is what does parabellum mean?

Parabellum is a Latin term that is commonly associated with the phrase "Si vis pacem, para bellum," which means "If you want peace, prepare for war." In modern usage, the term parabellum is often used to refer to a specific type of ammunition used in firearms, including handguns. The 9mm Parabellum, also known as 9mm Luger, is a popular caliber of ammunition used in a variety of firearms in military, law enforcement, and civilian contexts. The term may also be used metaphorically to refer to the preparation and readiness required for any difficult or challenging situation.