BS 1852?

BS 1852 Coding for resistor values
BS 1852(British Standard 1852). The letter R is used for Ohms and K for Kohms M for Megohms and placed where the decimal point would go.

At the end is a letter that represents tolerance Where M=20%, K=10%, J=5%, G=2%, and F=1% D=.5% C=.25 B=.1%


BS 1852 coding examples
R33 0.33 ohms
2R2 2.2 ohms
470R 470 Ohms
1K2 1.2K ohms
22K 22K ohms
22K2 22.2K ohms
4M7 4.7M ohms
5K6G 5.6K ohms 2%
33KK 33k Ohms 10%
47K3F 47.3 K Ohms 1%