Chickpea flour is flour made from dried chickpeas (garbanzo beans). Also known as garbanzo flour, gram flour and besan, Chickpea flour is a staple of Indian, Pakistani and Bangladesh cuisines. In Dr. Sebi Recipes you will see many recipes requiring chickpea flour, such as my Delicious chickpea pancakes.
Chickpea flour can be found at Amazon and Iherb very easily, but you can make your own at home from dried chickpeas. You'll need a food processor and coffee/spice blender.
You can roast your chickpeas lightly before grinding to yield gram flour or besan, but for many recipes that step is unnecessary.