Within these castle walls be forged Mavens of Computer Science ...

— Merlin, The Coder

Let x be a string of digits, such that:

Then, the value of in any particular base, , is calculated as:

The rightmost digit, is referred to as the **least significant digit**, or **LSD**. It is *least significant* because in terms of the overall value of the entire number, this digit will always have the least impact. Conversely, the leftmost digit, is referred to as the **most significant digit**, or **MSD**. It is *most significant* because in terms of the overall value of the entire number, this digit will always have the most impact.