Little stands to keep a hot teapot off of a delicate table.
There are even small ones designed for Yixing teapots, although they seem to be mostly for display purposes, as in actual use a Yixing teapot would be in its tea boat rather than on the table, or would be on a tea-tray.
Made out of wood, metal, felt, all sorts of materials and designs; many of them look quite nice, so I thought there ought to be a thread for them.