iTunes, glossary of icons required

[Rod]

Just lately I have noticed that the top right corner of the iTunes window has a number of icons which obviously represent various activities or actions but I have no way of knowing exactly what they mean.
They are a rotating line, a cloud with moving stripes, a cloud with a downward arrow and a cloud with moving stripes. Some are perhaps obvious like the cloud with the downward arrow i assume means a download from the cloud although i'm unclear as to what it is downloading the others well i just don't know. Anybody else found a glossary of what these icons mean?

 

[pm-r]

I don't know if any of these sites can help, but some have been asking the same question for ages now: Some I guess one is supposed to just learn by some sort of osmosis or some Apple secret, but maybe try these:

What does the dotted circle mean?
https://discussions.apple.com/message/28775756?tstart=0#28775756

https://support.apple.com/kb/PH12106?locale=en_CA

http://help.apple.com/itunes/mac/10.0.1/interface/index.html#itns4135057d

https://support.apple.com/en-ca/HT203564

 

[chas_m]

The cloud with the squiggle in it = iCloud Music Library cannot connect (for whatever reason, usually temporary)

Cloud with stripes = communicating with iCloud Music Library

Circle with gap in it = uploading new files to iCloud Music Library

 

[Rod]

chas-m that is sort of in line with my guess' (except the squiggle one) had no clue about that one, but the catch is I don't have iCloud Music Library switched on on any of my devices, unless Apple TV counts?