01 / THE IDEA
What does it mean?
Signifiers are cues that help people see what they can do and how to do it. In a list, a drag handle can signal that an item can be moved.
02 / IN PRACTICE
Make it concrete.
Illustrative example: A handle icon hints that a section can be dragged into a different order.
03 / WHAT TO WATCH FOR
A common mistake.
Making a clickable element look identical to static text.
04 / WHEN IT HELPS
When should you use it?
When a feature exists but users regularly fail to discover it.
05 / FURTHER READING
Explore the source.
Don Norman · 2008 ↗A reference for further learning, not an endorsement or verbatim quotation.