Good eye anon, kek.
So I looked at the Dec 2 post Q was referring to in Q3685.
https://qmap.pub/
Shrunk it way down to show the context.
Context is that he was confirming new tripcode on 8kun.
Those tripcode-confirming posts were enclosed in /right-slanted-lines/ like so.
So the meaning is that something pertaining to the pen will happen on 1/29 (tomorrow) at 11(am) – the USMCA signing with THAT SPECIFIC PEN?
It will form another Q proof if it happens.
I had wondered after all the USMCA fanfare for months, why he didn't sign it right away but held off for a while. Forming that proof may be the reason.