A decimal operator is if you do something 10 times in a row. For example

1 ++++++++++ 1 = 11

5 ++++++++++ 2 = 25

2 ********** 2 = 2048

You can abbreviate that by multiplying the number of repetitions to the operator:

1 +*10 1 = 11

5 +*10 2 = 25

2 **10 2 = 2048

Because you can leave out the multiplication operator you can write

1 +10 1 = 11

5 +10 2 = 25

2 10 2 = 2048

P.S.: I wrote „operators in decimal“ and I meant o fcourse decimal numbers, because anything else doesn’t make any sense - as I showed.