In documentation you'll see resistance labels like this: 470R.
What the heck??
Often, resistances less than 1K ohms are written with this International designation. Such as 1R, 470R. Resistances less than 1000 ohms have 'R' to indicate the position of the decimal point (radix point*). For example:
470R = 470 ohms
1R0 = 1.0 ohms
0R22 = 0.22 ohms
*Radix point
In mathematics, a radix point is the symbol used in numerical representations to separate the integer part of a number (to the left of the radix point) from its fractional part (to the right of the radix point). In base 10 notation, the radix point is more commonly called the decimal point.
- Wikipedia