Have you ever wondered what the symbols on the packaging of cosmetic products actually mean? This post will explain what they mean and why they're important for you to know. Period after Opening (PAO) What it looks like: A jar with floating lid with a number and letter 'M' What it means: The open jar symbol tells you how long the product will stay good after it's been opened. The number inside the jar indicates the specific number of months. "Best Before the End of" Date What it looks like: Little hour glass What it means: Product lifespan is less than 30 months and will have a "best before" date. The EU requires either the PAO or BBE . The US only requires expiration dates on OTC products like sunscreen. The "e" Mark or Estimated Sign What it looks like: Small lowercase "e" What it means: Symbol required by the EU for products for products produced or sold in Europe. If you see this symbol, it mea...