A fatty acid containing at least two double bonds is called a polyunsaturated fatty acid.

Here's why:

* Unsaturated fatty acids have at least one double bond in their hydrocarbon chain.

* Polyunsaturated fatty acids have more than one double bond in their chain.

Examples of polyunsaturated fatty acids include:

* Linoleic acid (omega-6)

* Alpha-linolenic acid (omega-3)

* Arachidonic acid (omega-6)

* Docosahexaenoic acid (DHA, omega-3)