Syntax

Place Name
A screen or location
  "Label" > Destination
An affordance (button, link) leading to another place
[Place Name]
Place highlighted in red (iteration / new)
  ["Label"] > Destination
Affordance highlighted in red
  {"Label"}
Affordance crossed out (removed)
  {"Label"} > Destination
Crossed-out affordance that had a destination

Based on Breadboarding from Shape Up.