In the UK, the minimum rate of interest at which the Bank of England would lend to the money market from 1972 until it was replaced by the base rate in 1981.
The top left trigram symbolizes summer, south, and heaven. The top right trigram represents autumn, west, and the moon. The bottom right trigram stands for winter, north, and the Earth. The bottom left trigram represents spring, east, and the sun. Effective date: 21 February 1984.