I tagged a question of mine pseudoinverse, but it got removed. Since a pseudoinverse is about matrices/operators that are not necessarily invertible, inverse is not exactly adequate, so I'd prefer adding this new tag. But I don't want to start an edit war (especially across at least 79 questions that might deserve it) so I'd rather hear community consensus first:
Is it ok to tag questions about pseudoinverses pseudoinverse?
Proposed tag-excerpt and tag-wiki can be found in a Community Wiki answer below.