The designation “4k7” is a common shorthand way of writing “4.7k”, where “k” stands for kilo or thousand. This is used in electronics to represent the value of resistors and other components. So a resistor marked as “4k7” would have a resistance value of 4.7 kilohms.
The reason for this notation is to avoid using a decimal point, which can be easily missed or misread, leading to confusion about the component’s value. This can be especially problematic on small components or in documentation where the decimal point might not be clearly visible. By using the “k” or other multiplier as a substitute for the decimal point, it makes the value easier to read and less prone to misinterpretation.