Just about everyone reading this is probably familiar with these three key facts about C:
I would go with the term of array decay. This term goes well with what it suggests. The C standard doesn't say about it in this context and yes the first day I heard the term I went for searching it in the standard but I couldn't find it (So it's a bit confusing regarding who coined the term etc). Also alternatively one can write due to "most scenarios array is converted into pointer"... - No this is not a single Noun. But this is not letting any misinterpretation to take place. Standard itself says it the "conversion".
Most of the time I try to say it the long way and then put the word ("array decaying") in bracket. In fact there are answers where I didn't even mention it and just went with the standard's words of conversion into pointer.