Backlog

For some people, it simply means a Development Queue: product ideas in varying levels of thought-out-ness that we haven't done yet.

In Dark Agile/Waterfall, someone thinks they can list All the tasks in the Project up-front, put them in the ideal order, add up the Story Points, and predict when the Project will be completed (Burn-down Chart). Any deviations from that plan must be blessed in advance, or forgiven as sins afterward.