From Forum Nokia Wiki

m is a scripting language designed specifically for portable devices. Similar to Python and Ruby in many respects, m is available on Symbian OS in the form of mShell, an interpreter and shell for running m applications, developed by airbit AG.

The m language supports elements common to many programming languages, such as various data types, if, while and for statements, arrays, functions, modules, and file operations. Detailed information is available in the file reference.pdf that comes in the mShell package.