Yr is the letter y
Anglo-Saxon Rune Poem (from ragweedforge.com)
Yr is a source of joy and honour to every prince and knight;
it looks well on a horse and is a reliable equipment for a journey
Yr is often translated as the yew bow by most. Yr’s meaning when it is reversed is lack of skill or ability, and a lack of efficiency. As it relates to the day, it shows that perhaps events of the day may be handled sloppily or carelessly. It might also be an opportunity for learning a skill, and being open to where your lack of ability is, might educate you in handling the events better. In examining the rune of the week, Ior, with Yr reversed, it shows that there might be a need for being open to learning how to handle the boundaries, and also straddling those boundaries as you work through them.