English: fret, meander or meandros Chinese: 回纹(饰) or 回紋(飾) (huí wén) Japanese: 雷文 or 雷紋 (raimon)
A decorative pattern, formed by a continuous line that meanders in a repeating fashion. Danbooru currently doesn't distinguish a meander,of Greek origin, from a Chinese fret, used for ramen bowls.