No one person can definitely identify every single random thing they might come across. That's why, when the thinking person is stumped, they might turn to r/whatisthisthing to let the internet solve the mystery.
This is a holder, but not for bananas. The neck of a wine bottle fits into the "spring" at the top, while the base sits on the circle at the bottom.
This is known as a stenomask, and it's used by court reporters to rapidly dictate what's being said in court.
It looks like a torture implement of some kind, but it's actually designed for pulling pork. I guess pork doesn't just pull itself.
I thought this was an old World War II munition, but it's actually an enclosure for underground cables. Once encased, the cables are protected from moisture.
This is known as a spline weight, and it's used for drafting. The hook is set along a curved track, which allows consistent curves to be drawn.
These wood rods, about three-quarters of an inch in diameter, were used in the construction of windmills back in the day.
This is a foot control that allows the occupant of the washroom to control the sink without using their hands.
This is a printer frame for making and copying blueprints. A draftsman would draw a blueprint on translucent paper, then the image would be imprinted on a separate piece of paper with light.
If anyone looked at this and immediately thought of spirographs, that's basically it: it's an old school instruction plate for a cycloidotrope.
You're looking at ground station pods for a StarLink satellite from SpaceX. This one is truly out of this world!
These are battery-powered motion sensor lights. In this context, they might be used to help people make their way up the stairs in the dark.
This one is pretty cool. It's a fish-finding smart buoy, and it uses solar power to keep finding those fish.
This is a GPS tag of some kind. This might be a company vehicle, or a car that's been loaned to someone who the owner doesn't trust.
This is an old-school film projector. The disk in the top right hides the picture as the rest of the film moves forward.
This is a chain guard. When attached to a large brush cutter, it prevents stones and debris from flying out and causing injury.
These squares are designed to counter erosion. Trenches are dug, then filled with a special mix that eventually will allow sediment to build up and protect the coast.
This is a self-defense tool known as a blackjack, or slapjack. It's almost like a set of brass knuckles. Careful though, as these are often illegal.
This is a highly-specific container used to transport, uh, sperm. It might be used to ship a horse's genetic material.
This, unfortunately, is most likely an example of mold or fungi. Life always finds a way, I guess.
This is a lead mold that was used as the cast for toy soldiers. Because it's lead, it's probably not a great thing to play around with.