1) Business term 
Safety stock (also called buffer stock) is a term used by logisticians to describe a level of extra stock that is maintained to mitigate risk of stockouts (shortfall in raw material or packaging) due to uncertainties in supply and demand. Adequate safety stock levels permit business operations to proceed according to their plans. Safety stock is h...
Inventory stock held in reserve as a cushion against uncertain demand (or usage) and replenishment lead time.
A back-stock of products kept to replenish shelves. 
Also called Buffer Stock. Extra stock kept by a company or business in case of extra demand or late deliveries of new stock
Safety stock, also referred to as buffer stock, is the excess inventory that a company carries to make sure they don?t run out of stock on something. You can think of this like just in case inventory. It?s extra merchandise stored just in case they run out of the items on the shelves.