According to the mini sits semi hangs trick or method or whatever is , it is a semibreve rest and it is hanging so it is semibreve rest it lasts for 4 counts.
I'm still confused.. The dots you use to count Minim and Semi are closer than the ones next to it... Ik i'm being stupid but i still don't know which one and how I'd use it in a *drumming music sheet*