Keyboard symbols:

• 
  ⌘ The Command key, usually next to the Space bar.
• 
  ⌥ The Option key.
• 
  ⌃ The Control key (usually labeled with "ctrl").
• 
  ⇧ The Shift key.
• 
  ⎋ The Escape key (usually labeled with "esc").
• 
  ⇥ The Tab key.
• 
  ↩ The Return key.

Frequently used terms:

• 
  BSD name: The internal unique identifier for a given network interface.
• 
  OTA: Over-the-air update. The update is downloaded via the internet and automatically installed.