It doesn't symbolise anything.
Ubuntu is the name of the product, 7.04 is the version.
All the symbolism is in the product name - and yes, there's plenty. The versions have whimsical animal names.
Even OS X has no particular Tiger-ishness in 10.4; it's not as if tigers are particularly renowned for having system-wide instant search facilities.
By that same measure, I'm also not aware of any inbuilt backup facilities sported by panthera pardus. I don't think they have to-do lists in their email clients, either.
Peter
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