Thank you Baker!
Apart from today's "Marker [9]" post, we've had three other posts with "Marker [X]":
# "Marker [1] confirmed"
# "Marker [1] Set."
# "Marker [2] Set."
So once again, 1, 2 & 9.
There was also "[Marker 1 Complete]", "National Presidential Alert System [2]" and other types/mentions of "[marker]".
Seems "marker" is rather generally used by Q as an expression. Even "Marker [X]" while likely a more specific type, still appears quite cryptic to me.
Who or which event is [9]? Can only guess that it relates to 01/29, 01:29 & the whole FISA thing. As a wild guess: some "head" like Brennan or Comey maybe?