Ran into this symbol on some sheet music today, and no matter what I used in my search query I can't find the meaning or name. It's the twisty I / )( shown above the note / below the Cm chord.
This is from this CCLI song: https://songselect.ccli.com/songs/90112/joy-unspeakable/viewvocalsheet
It's near the end of the sheet music.
Edit, while I don't think I can show CCLI's version of it on here, other versions of this song (which is public domain) doesn't have that extra symbol.
It does seem deliberate though. On CCLI, it shows up on both the Lead sheet music and the Vocal sheet music.