Big Iron

"Big iron" is a term used in computer science to refer to large, powerful mainframe computers. These machines were prevalent in the early days of computing, particularly in the 1950s and beyond, and were essential for scientific research and business applications. Companies like IBM were major manufacturers of this "big iron."

The development of these large computers was influenced by concepts like the stored program, articulated in a 1946 document by John von Neumann. While these early machines were powerful, they were also expensive and difficult to use, typically operated only by trained experts. The introduction of transistor technology and innovations like the IBM 360 architecture marked significant advancements, leading to a broader market and a greater emphasis on software. Despite the rise of smaller, networked computers, "big iron" continued to play a role in the industry.12