电气符号FR表示什么？

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(978227,1027334,451226,1228504,1054237,408168,874367,386798,1190281,978663,1387818,859392,781737,1111831,1038326,1775128,588548,1450901,575409,1566258,1364969,1493117,918884,1184567,384113,724446,1185500,535518,803423,1557400) ORDER BY field (ArticleID,978227,1027334,451226,1228504,1054237,408168,874367,386798,1190281,978663,1387818,859392,781737,1111831,1038326,1775128,588548,1450901,575409,1566258,1364969,1493117,918884,1184567,384113,724446,1185500,535518,803423,1557400)