What are the “cashews”?
What is commonly referred as “cashew” is the Plasma logo you can find on the default desktop, on the upper right corner, and on the panel, on the right hand side (left hand side if you use a Right-To-Left language). By clicking on them, you can access other configuration options, such as panel configuration and the Zooming User Interface (ZUI). Some of these, like the panel cashew, only appear if the widgets aren’t locked (see below).