Cast iron is a strong, heavy metal alloy composed mainly of iron, carbon, and silicon. While not a cybersecurity term, cast iron is known for its durability and resistance to wear, making it a popular material in vintage tools, cookware, and machinery. Its robust properties allow it to withstand high temperatures and heavy use. In cybersecurity contexts, 'cast iron' may be used metaphorically to describe strong, resilient security measures or systems. However, it is not an established technical term within the cybersecurity field.