Write
Three nouns and one way to write a card. Pick what this is.
Block
A piece of roadmap: what a quarter is spent on and what a customer is told about.
Hangs under nothing. It is the top.
Feature
Something that gets delivered, and what a release note ends up naming.
Hangs under a block.
Task
What somebody picks up on a Tuesday. A bug and a spike are the same card with a
different word in type, and the terminal writes those.
Hangs under a feature, or straight under a block, which is loose rather than wrong.