Iaido is not unified, so there's no single ranking system. There are, however, some more common ones like the kyu-dan system used by the International Kendo Federation (FIK) which was inspired by the system used in Judo, but uses no visible indication of rank like coloured belts.

Iaido is a traditional Japanese martial art whose origins date back to the 16th century. It is organized into groups of prescribed movements which are practiced without a partner. Each of these techniques consists of drawing a sheathed sword, making one or more cuts and then re-sheathing the sword.