A Whole Bunch of One Offs
Are day of the week Abbreviations accessible?
No, no they aren't. Izzy looked into this for me and could not find anything that would indicate that it would be supported by screen readers.. so correct this to a full day. Su>Sunday, M>Monday.. etc.
Can Arrows be placed in the header of a page?
Yes. Holly let me know that she has used emojis in the past and so far it has not affected accessibility. Schweet!