It also is used as in what has just changed? “ what’s the Delta?”
Could mean shift change for Q as in tone may differ slightly depending on who has the con for this shift..
Delta could be Gitmo per Corsi YouTube.
At one point Trump was leaving Qposts - his Q signature is the Fight Fight Fight cheerleader style and he signed off and said no further posts from him back in Jan.
Q branch is The Calm before the Storm...
http://www.newsweek.com/trump-calls-dinner-military-leaders-calm-storm-679367