What exactly is “number” and “issue”?
Sometimes I read “volume”, too.
e.g. A journal released 2017 as the third one (number 3) in that year.
The biblatex manual contains the definitions of these terms.
See section 2.2.2
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Of course I read the biblatex doc. 
But I am always running into the same questions from time to time. Let me give you an example.
http://www.dialog-ethik.ch/produkt/tif-115-roboter-im-gesundheitswesen-2/
This is “115”. Is that a “number” or “issue”?
For general: When do I use “number” and when “issue”? When do I use both of them? In some journals it is not clear for me.
I know the pain and as always the answer depends:
Some maybe helpful links:
http://linguistics.byu.edu/faculty/henrichsen/APA/APA06.html#issue
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And about the history:
So in my example there is no volume number. There is only the year (2014) and the issue (115).