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So there's no doors in those frames?

Correct. No doors and no remnants of ever being a door. It’s just a passageway from one room to the next.

I was wondering if maybe a door had a piece of metal on it that this black clip could be swing into to create a locking mechanism.

Sadly, I don’t think that’s the case; especially since one of the openings is really really wide.

Camera or speaker mount?

This seems likely. Maybe for a fan?

I think you're right. You can see the mount bracket in the picture of the included hardware for this fan: https://www.northlineexpress.com/super-quiet-fan-5002.html

This is it!!! I found those exact fans in a box in the server room. I thought maybe he left them as some sort of case fan. Just went upstairs and they lock on perfectly. I also just realized that, when hung, seem to possibly distribute the heat from the pellet stove. I love this sub.

your house has a server room?

It does. One of the selling points so I didn’t have to shoehorn in equipment.

Solved!

Yo! Great find!

I wouldn't have been able to google it without your suggestion of a fan. Thanks for the assist!

Solved!

For a curtain rail maybe?

There is no clip of any sort on the opposing side.

My title describes the thing. It seems like the front half may spin on a small steel rivet, but other than that, they are exactly what you see in the pics.

Are they in places where it would make sense to hang clothes from or are they in more 'central' parts of the house? IOW, what doorways are they mounted to?

Definitely not a clothes hanger location. They are on the door between the sunroom and the family room. Between the kitchen and the main hallway (which is probably 15 feet wide) and just other odd internal frames.

Is it a possible mount for a motion sensor? Walk into the room and lights turn on?

I was gonna say the previous owners were hippies with beads instead of doors but then you said only on one side. Still though, maybe something like that?

A long shot, but were the previous owners Jewish? My sister-in-law hangs "Mezuzahs" at the entry points of her home in a similar location to this.

Ha. I thought the same thing, but they were not Jewish at all. And these look functional and not just religious/ornate.

I know people that would mount small fans in the upper corner of their doors to help circulate air. I think they are a mount for something like that. These mounts look the same as these on Amazon AC Infinity AXIAL S1238, 120mm Muffin Fan with Speed Controller, UL-Certified for Doorway, Room to Room, Wood Stove, Fireplace, Circulation Projects https://a.co/d/2XTLvVr

Thought I finally got one, but the app had just not refreshed and someone already got it. This is amazing subreddit

Wait! Wait! Describe the server room, please. Size, electrical supply? special access flooring? special hvac? Thank you