- Definition: Amber is a petrified tree resin. According to Greeks, when amber is rubbed against a rod along with a piece of cloth, the amber attracts a small piece of dust.
- A glass rod, a plastic rod, or a hard rubber when rubbed against cloth, display an amber effect which is commonly known as static electricity.
Therefore, the root of words like electricity, electronic, and electrostatic is the ancient Greek word electron, meaning amber.