The collection.list is for the /collections/ page. This is the page that lists all of your collections. You will want to see here for more details on this.
Hope this helps,
Ah ha. I see now. the "Collection.list.liquid" is a theme file. When you create a new collection, you are prompted to set the theme. By default the theme of a new collection is "collection.liquid". However you can change it to use collection.list.liquid. I don't think there is anything special about the word "list". You can probably put any word there, such as "collection.my_fancy_theme.liquid" or "collection.foobar.liquid", etc.
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