I'd agree with Paul and say that LICEN[CS]E* is fine and more sustainable long-term.
Seeing that the interim license is project-specific I'd say it's no problem. I don't think the acronym is widely known. (It is not designed to be used in other project trees besides Ubuntu font branches and also has not got FSF or OSI recognition so can hardly be called typical).
I'd agree with Paul and say that LICEN[CS]E* is fine and more sustainable long-term.
Seeing that the interim license is project-specific I'd say it's no problem. I don't think the acronym is widely known. (It is not designed to be used in other project trees besides Ubuntu font branches and also has not got FSF or OSI recognition so can hardly be called typical).