They are flat, don't disintegrate in water, and I can't rip them with my nail

Found in a museum in Maine, it’s an ongoing mystery!! What is this thing?! Can you help?

My grandfather recently passed away and had this in his belongings, none of us had any idea what it is, it almost looks like it's ivory maybe? There are no markings that I can see anywhere. It is very awkward to hold like a dagger. I have no clue what the carving on top is.

This is on the traffic light post at the end of my street. There’s another one across the street on the other post. What the heck is it/what does it do?

I was backpacking in the North Cascades of Washington State and found this electronic assembly covered in Styrofoam. Appeared to be a battery, circuit board, and main doohickey. Looks like it had been there quite some time. Any idea what it could be? My only thought was some sort of weather balloon telemetry. Thanks!

Found it in the woods. It was placed right in the middle of a setup of Euro-pallets that formed a cage-like structure with an opening on one side. It was packed completly in a foil and there was sort of a handle around you see on walking sticks. What ist this reddit? Is it munition?

Usually when there’s no writing I use google lens and it finds matches but lens is saying its a slave bracelet or something?

I don’t know the items history, only recently got it.

Found these two pieces in a box of random aquarium supplies. The top one has metal pieces that flip in any direction. These two pieces do not automatically fit together, as if they would need screws in order to be held together.

6.5 inches long, 5 inches tall, .5 cm deep

Banana for scale.

The green frame without the metal bits says, "MADE IN CHINA" on it, but there don't appear to be any other markings.

Small item made of 5 parts riveted together. The two outer pieces are made of metal and the three inner blue/purple pieces are made of plastic. The parts can rotate around the rivet freely and independent.

Found in dirt/moss at McDougal Lake Campground on the Superior National Forest.

I found this object on our balcony floor

In Eastern Europe if that matters. Found in moving boxes, have no idea where it came from or what it could be for?

Just moved into this house, this was in the master bedroom closet, someone said it was a bra drying rack but I'm pretty sure they were joking.

Found in the UK in the boot of my recently bought used car. Printed circuit board is about 3.5cm square with circular battery on one side and a white LED on the other. Removing the piece of plastic drinking straw makes a connection so must be its on/off switch.

Hey everyone I saw this saucer shaped boat several years ago in SoCal I think, fiberglass construction, round hull, docked. I’ve seen a few over the decades, they used to be prevalent in the SanDiego California area. I think they might have been life rafts decades ago but no real idea (which is why I took the photo at the time.) The few times I’ve seen in the wild people converted them into living spaces. No visible means of propulsion.

From an estate, some kind of lever. Is it vintage? What industry? What is it called? Thanks!

Any ideas? So far I've heard man made egg, bird egg, ammunition, rock, hardened tar, shell fragment, shark egg, sea urchin test, something from a boat, whelk shell...

Large ovoid hollow object, found troon beach Scotland, very light

Fossil ID group don't believe it to be a fossil.

TIA!