What does this symbol from inside the Kaaba mean?

Question

I was going through a video of inside the Kaaba and came across this symbol. I can partially understand what it says. Any help appreciated.

Answer 1

It's the shahadah written in square Kufic calligraphy. Since the image provided is so blurry, here's a clearer version:

The colored arrows on the second image indicate the direction it's supposed to be read: Red→Green→Blue→Purple→Orange.

For ease of reading, here's a similar rendering — also square Kufic, although using a different glyph for the ه (ha) — which maps this out in a more legible manner, along with the more common modern Naskh rendering: