Tombo means dragonfly in Japanese. It's also the name of this very nifty bamboo tool I learned how to make at ceramics school last week. It is a traditional Japanese measuring gouge used for making duplicate cups or bowls on the pottery wheel. It gives you a target width and depth of a bowl when you are making a matching set, which is what I will be attempting to make in my wheel throwing class.
And I wouldn't be me if I didn't decorate all my throwing tools with my wood burning tool, right? :)