This person doesn't understand basic physics

What is this pin called? And bonus points if you can tell me how to remove it.

Found this in front of my window

I have no idea why it was left there.

Outside of a home built in 1970

Found in the floor when cleaning the room

One guess was a bullet tip or something I think it's a tool of some sort

Cement(?) balls. Found originally in a pile of maybe 20-25 on my kids school grounds. Didn't have my phone the first time and most have disappeared by now.

What do the pictures for June and September meant to be signifying?

I bought this busy book for my baby but can't figure out why there is a pair of glasses and mustache for June and a hard hat/hammer for September. I am already annoyed that November appears to show Halloween as surely this should be shown in October...

It's 2 feet off the floor in the living room

There's no opening and nothing on the other side of the wall. I live in a townhouse.

Part of a collection...

We were told he got this from one of his foreign military travels in the late 40s...no clue what its for or what it is. Looks like something like a bell but enclosed with a hole for a tassel??

Bought at an estate sale. Looks possibly Hindu?

Found at mall food court. It took away my appetite for Chipotle it was so freaky.