I've posted this image which I've described as a "Three-spoke dovetailing tile tessellation". Trispokedovetile tessellation by Peter Dow, on Flickr which is a tessellation of this tile shape, Trispokedovetile by Peter Dow, on Flickr Check my Flickr page for the preceding design iterations and inspiration. I've named the shape Trispokedovetile which is a contraction of "tri-spoke dovetailing tile". "tri-spoke" because the shape is similar to a 3-spoke motorcycle wheel with three bites taken out of it. "dovetailing" because the tiles interlock like a dovetail joint But it is quite possible this shape is already known to geometry and already has been named. Do you know if this shape has already been named? If so please do reply to tell me what the name is.