The first time you attempt to do something, you'll get it wrong, so build a prototype first. (Another way of saying we might not know how to do this.)

Describe how something should be done so that when you start, you don't make a mess

Issues that are queued to be worked on now (but are not currently in development)

Issues that will be tackled at some future point (probably in a month)

Issues that are currently in the planning stage

Big picture discussions, clarificiations, and direction. “Where do we want to go?” rather than, “How do we get there?”

The issue has been implemented, prepared, and packaged. It is currently waiting on the results of testing (unit, integration, functional, or production) before being closed. Basically, really almost done (for real).