Fig - 2: Metric Multiplication
The abbreviations and case are important - "m" is quite clearly
different from "M".
In general, values smaller than unity use lower
case, and those greater than unity use upper case. "k" is clearly
an exception to this.
There are others that go above and below
those shown, but it is unlikely you will encounter them. Even Giga
and Tera are unusual in electronics except for determining the size
hard drive needed to install a Microsoft application.