This photo was taken by Lamya Lotfey, a Egyptian Coptic Christian. She posted this photo in her Facebook public profile on Sunday, October 16, 2016 at 5:01 pm (according to GMT +6, timezone of where I live).

According to my native Arabic speaker friend, the photo is "instructions how the dress of school must be." The photo was then published by AL Ahram newspaper (credit to DavePhD) with the following caption.
A sign stipulating Islamic veil as a mandatory part of girls' dress
code at a school in Egypt's Sharqiya governorate.
Archive.org link to original photo.