I joined this forum to ask what the purpose of this outlet (see attached) is. I've found it in my room after moving around some furniture, and I don't really see what it could be used for. After searching (including reverse image searching), I could only find that it is apparently a "Despard" outlet covering. If any of you could help me understand what this is and what it is used for, it would be much appreciated. Thanks.
Yes, that was used as a TV-FM connector way back. If you remove the two screws and the wall plate, you should find a 3-gang bracket with a module in the center bracket, probably attached to a metal wall box. Odds are you'll be able to eyeball the 300 ohm twin-lead without any further disassembly. If you have an antique roof antenna still, it might even be connected to it. Knowing the age of the house is relevant.
The Despard wall plate format was popular once, to the point of being called a modern standard at the time. There were many switch, light, and outlet modules available, sometimes in combinations that would not pass muster today (e.g. a TV connector and AC outlets could be in the same box). I remember seeing a lot of them in US 1950's era kitchens (I'm old enough to remember the 60's myself). The basic Despard modules and wall plates can still be had. The variety of less common modules are no longer made.
Here's a page that covers some of it:
https://www.kyleswitchplates.com/despard-switches-outlets/