CREATE TABLE table_23648 ("Standard Yarn Weight System" TEXT, "Yarn Type  ( US ) " TEXT, "Ply  ( UK ,  NZ ,  AU ) " TEXT, "m/100g" TEXT, "Wraps Per Inch  ( WPI ) " TEXT)

Name the standard yarn weight system for 9 wpi
SELECT "Standard Yarn Weight System" FROM table_23648 WHERE "Wraps Per Inch (WPI)" = '9 wpi'
SELECT "Standard Yarn Weight System" FROM "table_23648" WHERE "Wraps Per Inch (WPI)" = '9 wpi'