The unit "ohm" (symbol: Ω) is named after **Georg Simon Ohm**, a German physicist and mathematician. Ohm is best known for formulating **Ohm's Law**, which states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor.
In simple terms, the ohm is a measure of **electrical resistance**. If a component has a resistance of one ohm, it means that a current of one ampere will flow when a voltage of one volt is applied across it.
So, the ohm (Ω) represents how much a material resists the flow of electric current.