sled, sleigh

橇 is composed of the radical of 木 (wood) and 毳 (fine animal hair). 木 is the pictograph of a tree, indicating wood or timber that can be made into various tools, while 毳 refers to the fine, soft down on birds and beasts; this down is light and soft, easily moved or blown by the wind, and thus extends to the idea of swift sliding. Therefore, 橇 refers to a tool that slides swiftly over snow (i.e., a sled or sledge).