It is an interesting question (and one that I think we have answered before, though the answer escapes me). The first point to note is that most style manuals dislike the term heartily and suggest recasting. Having said that, note that the virgule means 'or', so that 'and/or' can be translated as 'and or or'.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.