Do you think that I know what this means 😄 Those words are literally copy-paste from the documentation. Now looking at these so many buffers, I don't know why they are so many, but this is what is written here: https://www.mql5.com/en/docs/indicators/igator
Note
Buffer numbers: 0 - UPPER_HISTOGRAM, 1 - color buffer of the upper histogram, 2 - LOWER_HISTOGRAM, 3 - color buffer of the lower histogram.
I have no idea what upper and lower histograms are, as I don't know how this particular indicator is used, but my assumption is that you know (and that's why you are using it). You can try "Trace" and see what this buffer mean, and probably tell me how to rename it better 🙂