Slow German 233 includes the following sentence:
Also: Mein Teekesselchen ist oben an jedem Zimmer dran.
Duden offers no definition for "dran", only a variety of examples of its use, of which there appear to be many, without an obvious pattern of meaning. In an attempt to understand what purpose this word (if that is what it is) has in the given sentence I looked at the Google translation of the sentence with and without including it. With:
So: my kettle is on top of every room.
So: my kettle is upstairs in every room.
Assuming these translations accurately reflect the effect including this word has on the meaning of the sentence it would appear to cause the "oben" to point to the "Zimmer" rather than the general upstairs. So is that what "dran" does, is cause a direction to point at or in a specifically designated thing?