fylfot (n.)youdaoicibaDictYouDict[fylfot 词源字典]
supposedly a native name for the swastika (used as a decorative device), but only attested in a single, damaged c. 1500 manuscript, and in that it might rather refer to any sort of device used to fill the bottom (foot) of a design. "[I]t is even possible that it may have been a mere nonce-word" [OED].[fylfot etymology, fylfot origin, 英语词源]