קַו qav (H6957)

a cord (as connecting), especially formeasuring; figuratively, a rule; also a rim, a musical string or accord

1) cord, line, measuring-line 1a) cord 1b) measuring-line 2) (BDB) onomatapoetic mimicry of Isaiah's words, perhaps senseless

or קָו; from קָוָה (H6960) (compare קָוֶה (H6961));