What is the name of the random number generator used in the British television show 'Countdown'?

'Countdown' is a British game show that has been running since 2nd November 1982. It involves two contestants competing against each other to make the longest word out of a random selection of letters and solve mathematical problems using randomly selected numbers to reach a three-digit number. The number is generated by an electronic random number generator called CECIL, which stands for Countdown's Electronic Calculator In Leeds. The full name references the original filming location of the programme.

At the beginning of each number round, one contestant chooses six face-down number tiles, which are arranged into two groups: 20 "small numbers" (two each of 1 through 10), and four "large numbers" of 25, 50, 75, and 100. After CECIL has generated a random three-digit figure, the contestants have 30 seconds to work out a sequence of calculations with the chosen numbers to reach the target number or as close to it as possible. Contestants may only use each number once but do not need to use all six. They can only use the four basic operations of addition (+), subtraction (-), multiplication (x) and division (÷). The contestant who solves the calculation or comes the closest wins the round.

CECIL was so named in tribute to the former Head of Entertainment of Channel 4, Cecil Korer (1924-2011). He was responsible for commissioning several of the channel's early shows including 'Countdown'.