Hello, I am trying to create an unique value given

Question

Hello, I am trying to create an unique value given

3 arrays with 5 elements each. I thought I could use 3 loops but I still cannot figure out how can I do it, is there any place where I can learn about this? This is the example code I got.
const arr1 = [1,2,3,4,5]
const arr2 = [6,7,8,9,0]
const arr3 = ['a', 'b', 'c', 'd', 'e']

for (let x = 0; x < arr1.length; x++) {
for (let y = 0; y < arr2.length; y++) {
for (let z = 0; z < arr3.length; z++) {
}
}
}

// Output e.g. 16a, 17a, 18a, 19a, 10a, 16b, 17b