I believe this is an issue that would affect all StackExchange sites and therefore is a much better fit for the general Meta StackExchange.
Still, I can not support this proposal (only this is the meaning of a downvote on Meta) because I feel that existing icons are sufficiently explained in the Tour which we expect all new users to read.
Sadly not everybody does as judged from the low count of "informed" badge holders in relation to the user count. This would not improve from a new icon layout. In addition to that an explanatory pop-up for those who don't care about the Tour already exists.
In summary I feel that a new icon layout on Ask Ubuntu would be an issue for the harmonised network-wide user experience and may not really be needed.