The Nimrod, built in the United Kingdom by Ferranti for the 1951 Festival of Britain, was an early computer custom-built to play Nim, inspired by the earlier Nimatron.

The twelve-by-nine-by-five-foot (3.7-by-2.7-by-1.5-meter) computer, designed by John Makepeace Bennett and built by engineer Raymond Stuart-Williams, allowed exhibition attendees to play a game of Nim against an artificial intelligence.

The Nimrod was intended to demonstrate Ferranti's computer design and programming skills rather than to entertain, though Festival attendees were more interested in playing the game than the logic behind it.

In late 1950, John Makepeace Bennett, an Australian employee of the firm and recent Ph.D. graduate from the University of Cambridge, proposed that the company create a computer that could play the game of Nim.

It explained that the use of a game to demonstrate the power of the machine did not mean that it was meant for entertainment and compared the mathematical underpinnings of Nim with modeling the economics of countries.

BBC Radio journalist Paul Jennings claimed that all of the festival attendees "came to a standstill" upon reaching the "frightful" "tremendous gray refrigerator".

[2] After the Festival, the Nimrod was showcased for three weeks in October at the Berlin Industrial Show, where it also drew crowds, including the West Germany economics minister Ludwig Erhard.

Nim was used as a demonstration program for several computers over the next few years, including the Norwegian NUSE (1954), Swedish SMIL (1956), Australian SILLIAC (1956), Polish Odra 1003 (Marienbad, 1962), Dutch Nimbi (1963), and French Antinéa (1963).