MBM is shortened from MultiBitMap

Bitmap

In computer graphics, a bitmap or pixmap is a type of memory organization or image file format used to store digital images. The term bitmap comes from the computer programming terminology, meaning just a map of bits, a spatially mapped array of bits. Now, along with pixmap, it commonly refers to...

 which, as the name suggests, is a container for a set of bitmap

Bitmap

In computer graphics, a bitmap or pixmap is a type of memory organization or image file format used to store digital images. The term bitmap comes from the computer programming terminology, meaning just a map of bits, a spatially mapped array of bits. Now, along with pixmap, it commonly refers to...

 images. The contained bitmaps are not stored verbatim. Rather, each one is stored with a modified bitmap header with no data compression or with 8-, 12-, 16-, or 24-bit RLE

Run-length encoding

Run-length encoding is a very simple form of data compression in which runs of data are stored as a single data value and count, rather than as the original run...

 compression.

MBM files are used by most Symbian GUI applications

APP (file format)

APP is an abbreviation for application. The filename extension .app means application in Symbian OS, SkyOS, GNUstep and Mac OS X.On the latter two systems, a .app file is actually a folder containing binaries and supporting files....

 to store their graphical content.

See also

• Symbian OS
• Symbian Ltd.
  Symbian Ltd.
  Symbian Ltd. was a software development and licensing company, known for the Symbian OS, a smartphone operating system, and other related technologies...
  
  
• Symbian installation source
• Symbian application