Among the following , multiple of 3 is 

Multiple: The product of number and counting numbers are known  as the multiple of that number. Multiples of a given number are all those numbers which are exactly divisible by the given number.

Multiple of  3  is $\text{3},\text{6},\text{9},\dots \dots \mathrm{......3}k$

The multiple of 3 is in the form of $3K,K\in N$