Where can I find a web page that describes resistor value designations?

I have a schematic that calls out a resistor value of 4K74. Is this 4.7K?
If so, what's the last "4" for? If it's not 4.7K, what is it?

Further, there are values of 681R (681 ohms?), and 27K4 (? ohms).

Did the Google thing but never found a formal chart.

TIA

Mike