Originally posted by Greg Jennings
One humorous tangent: my bokken is even thicker and heavier than most Iwama bokken. The first time I visited Hans Goto Sensei, he took one look at it and said something like "What a club that one is!". The name stuck. My bokken is known in my dojo as "the club".
We have one of those at our dojo, they are generally refered to as suburi bokken because they are sometimes used to do your suburis with (suprise!). Good for strengthening your wrists.