Yup...I've flown Emirates about a half dozen times over the last few years and they have that.It's not large but it is obvious.
A few people pray in the aisles even though they dont need to while traveling.
I never saw that but I did see people who appeared to be praying...Arab type people.
Years ago some of the USAF folks on the AWACS hid a magnet under the floor where the Saudi crew put their rugs during the 14 hour missions. The rugs had a compass in the corner.