What is Feret Angle in image processing?

I am using ImageJ to measure my image. Using the-free hand tool I was able to measure few features. There is one value feret diameter. I understand it well. But I couldn’t understand feret angle? Also, having a more feret angle or less feret angle, what does it actually means?

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Hi Mathew. Still I’m not clear about Feret Angle. What happens with more feret angle or less feret angle?