Thanks Mav,Tony, the textbook definition was two consecutive closes at >=9. The idea was not to get faked out by a single +10 print. I don't hold strictly to that. I generally look for that level to hold. In other words, look for constructive development i.e. NLs moving higher vs lower. And also relative 30 NL movement. For example say AAPL's 30 NL was getting stronger while the ES was getting weaker.
Regarding the meaning of a number line confirming ... my understanding is that a NL confirmation does not necessarily say anything about the given market's trend (however you define that) but rather means that there is a confirmation of underlying strength/weakness in the given market. If that an accurate interpretation?