This is so interesting! Thank you Adelfa. But, I'm still confused. The hand goes sideways I think I get that (cracking up LisaP). Then if I put, say, my left hand under my chin with the knuckles pointing outward directly under my chin - the pointer finger knuckle under my chin is what I think you all are doing - right? But then I don't get Anabella's comment about having an inch or so ABOVE her pinky? How is the hand positioned to have anything above it? But if you do what I'm thinking - where is the bottom of the neck? Is my neck weird or something because I could use a variety of locations - where my neck meets my shoulders is higher than those 2 little bony bits (collar bones). Also I'm assuming you have to position the chin straight ahead otherwise you'd get a drastically different result.
I think I have an average to slightly long neck according to this test - if I'm doing it right. I do have weirdly small hands. I discovered that when I helped out in a 3rd grade classroom and they were tracing their hands to make Turkey pictures. My hand was smaller than most of the 3rd graders!
For the chin drop test that dianthus recommended, I don't get how you can even have your chin resting on your chest - but then again I'm completely inflexible! If I stretch really hard, the bottom of my chin hits my collar bones. Well, actually it's the double fat chin part hitting my collar bones - so what does that mean? Average? I guess average would make sense since nobody's ever commented on my neck.
Diana, those visuals really help. I guess it's easier to see on other people than on myself.