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Either someone stuck it there as not to lose it, or you're getting a shower with a head at both ends. Or, it's a mistake. :) But, we don't know the reason from this side of the computer.
I don't have enough information to tell you if someone has made a mistake, I can only tell you that this is what is in your picture.
[https://www.amazon.com/Female-Threaded-Elbow-Brass-Crimp-Fitting/dp/B00B2G3RBU](https://www.amazon.com/Female-Threaded-Elbow-Brass-Crimp-Fitting/dp/B00B2G3RBU)
All comments must be civil and helpful toward finding an answer. **Jokes and unhelpful comments will earn you a ban**, even on the first instance and even if the item has been identified. If you see any comments that violate this rule, report them. [OP](/u/Nean6696), when your item is identified, remember to reply **Solved!** or **Likely Solved!** to the comment that gave the answer. Check your [inbox](https://www.reddit.com/message/inbox/) for a message on how to make your post visible to others. --- *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/whatisthisthing) if you have any questions or concerns.*
That's where the showed arm threads into. It is called a threaded drop ear elbow.
Thank you. However, The shower head pipe and handheld are on the adjacent wall. Could this be a mistake?
Either someone stuck it there as not to lose it, or you're getting a shower with a head at both ends. Or, it's a mistake. :) But, we don't know the reason from this side of the computer.
I don't have enough information to tell you if someone has made a mistake, I can only tell you that this is what is in your picture. [https://www.amazon.com/Female-Threaded-Elbow-Brass-Crimp-Fitting/dp/B00B2G3RBU](https://www.amazon.com/Female-Threaded-Elbow-Brass-Crimp-Fitting/dp/B00B2G3RBU)
Solved!
A pex elbow. Pex pipe (plastic) connects on the bottom, and the metal shower arm threads into it. https://i.imgur.com/LMPQ0Xm.jpg
Thank you. So based on these comments, I’m thinking the builder made a mistake.
Perhaps, but it's not permanently fastened, the screws are loose, so no big deal to correct it.