CREATE TABLE table_23647 ("Standard Yarn Weight System" CLOB, "Yarn Type  ( US ) " CLOB, "Ply  ( UK ,  NZ ,  AU ) " CLOB, "m/100g" CLOB, "Wraps Per Inch  ( WPI ) " CLOB)

Name the standard yarn weight system for 7 wpi
SELECT "Standard Yarn Weight System" FROM table_23647 WHERE "Wraps Per Inch (WPI)" = '7 wpi'
SELECT "Standard Yarn Weight System" FROM "table_23647" WHERE "Wraps Per Inch (WPI)" = '7 wpi'