
Its intrinsic relationship with the interval of a Perfect 4th, as well as with the Pentatonic Scale, has also been noted.
So, to expand a bit on the topic, let's take a look here at a particular 4-note "pitch collection".
We'll combine a sus2 and sus4 and call it an 0257 tetrachord (C-D-F-G) - 'cause, well... that's what it is!