Can someone explain these symbols / icons to me?

Hi everyone, I've tried finding answers to these queries online with google searches, here on this forum, and through the iTunes Help function but no luck. Its just basic stuff but I found no explanation in any tutorial so maybe someone can enlighten me.
I use the sidebar in iTunes. At the top is the Library list - Music, Films, TV Programmes, and iTunes U. Here are my questions:
There is a little cloud symbol beside the Music, Films and TV tags. What does this cloud mean?
Sometimes, the clouds are animated with moving diagonal lines inside them. What does that mean?
Sometimes a number appears beside the tags. What does this number mean?
I use Home Sharing to share iTunes libraries between two PCs. Even though the Library is the same on the two PCs, the numbers (from question 3) are different in both libraries. For example, I have a number 6 beside the Music tag in the Library on the sidebar on one PC, and no number beside Music on the other PC. Also, I have just for the first time downloaded 24 files from iTunes U. I have not downloaded anything from the iTunes U before. The number 6 now appears beside the iTunes U tag in my Library on the side bar of the PC to which I downloaded the files, and 6 appears on the other PC. Why are these numbers different?
Explanations would be appreciated. Thanks!
MP

Thanks Bill,
But still not really what I'm talking about. I have inserted a screen shot image to show what I mean.
The cloud symbols that sometimes have animated diagonal lines running through them are not beside any songs, as you can see - they are beside the words "Music", "Films" and "TV Programmes" under "Library", as in the screen shot. I have no TV programmes on either of my PCs. I have 5 films, all of which have been watched many times.
The numbers (here a 2 beside "Films" and a 7 beside "iTunes U")) can't be the number of times played - e.g. apart from the movies being watched over and over again, I have not yet watched anything from iTunes U. Also, as per my original question, that 7 beside iTunes U is a 6 on my second laptop.
These symbols must have a meaning....! It would just be nice to know what they are.

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