What’s This Image On The YMCA Building?

I noticed this image on the side of the YMCA building in Des Moines the other day while walking back to work from the bank. I’d never noticed it before so I snapped a quick photo. After looking online for an hour or so, I haven’t been able to find out what the image represents.

Does anyone have any ideas? I made a much more detailed post on Medium, that includes “old” YMCA logos, which this is definitely not. Googling YMCA logo was little help.

If you have any ideas about what it’s meaning is, or anything really, you can drop a comment here or on the thread at Hacker News.

UPDATE: Thanks to HN reader MaysonL, it’s pretty safe to say it’s a variant of the “Chi Rho” symbol. Looks pretty much spot on to me.