Tiny hat for yamulke/kippah. The hat that jewish people wear. I'm not sure if he came up with this one.
"Noticer" is something that people on 4chan say, but I've also seen a number of influencers using this term. "Noticer" basically means someone who blames jewish people for bad things happening or believes in a global jewish conspiracy theory. A related dogwhistle is "coincidence". The person will allege that there is a global jewish conspiracy theory and then sarcastically say call it a "coincidence".
Emphasis on blaming jewish people, not blaming Israel. Rathbone spends a considerable amount of time on his stream accusing Jewish people of some global conspiracy, not just Israel.
(cw 4chan shit)
https://knowyourmeme.com/memes/the-great-noticing