And the number basically designates the position of that double bond with respect to that Omega reference atom. So two different ways to basically describe the position of that double bond within that particular fatty acid. Now the final thing I'd like to focus on is the properties of these fatty acids and what basically determines the properties of these fatty acids. Well, two things basically describe determine the properties. It's the length of that fatty acid and the number of double bonds within that fatty acid. So let's begin with the length.