一、 marker meaning? Ordinal number? What does the drop in 一、 mean?
It'a punctuation, which does not exist in English, and I don't know its English name.

In Chinese it's called 顿号 (dun4 hao4). It is usually used between listing of things (or verb, or adjectives ... I don't know the grammar term, who can help me please edit the post):

屋子里有桌子、椅子、凳子。


Usually in English, comma would be used.

In your example, it is just used a symbol separating the listing number and the title, which is not related to the use I mentioned above. This is common when Chinese numbers are used. The punctuation itself does not carry actual meaning.