Final answer:
ACSR stands for Aluminum Conductor Steel Reinforced, which refers to the composite cable design used for overhead power lines that balances strength, conductivity, and corrosion resistance.
Step-by-step explanation:
The acronym ACSR stands for Aluminum Conductor Steel Reinforced. This type of conductor is used in overhead power lines, where aluminium is wrapped around a steel core to give the cable added strength, allowing it to span long distances without breaking. Although gold can be used in crafting wires due to its resistance to surface corrosion, aluminium is much more practical for power line applications due to its combination of conductivity, strength, and affordability.