This is a clear and unambiguous shorthand way to write or label a resistor value. You often see this notation on circuit disgrams because it takes up so little space.

Resistance

Normal

BS1852

0.47 Ohm

0.47 Ω

R47

4.7 Ohm

4.7 Ω

4R7

47 Ohm

47 Ω

47R

470 Ohm

470 Ω

470R

4 700 Ohm

4.7 kΩ

4k7

47 000 Ohm

47 kΩ

47k

470 000 Ohm

470 kΩ

470k

4 700 000 Ohm

4.7 MΩ

4M7

You might encounter a code like this. 4k7J. The final letter denotes the resistor tolerance.

Letter

Tolerance (±%)

F

1

G

2

J

5

K

10

M

20