A BANG file is a point access method which divides space into a nonperiodic grid. Each spatial dimension is divided by a linear hash. Cells may intersect, and points may be distributed between them.

Another meaning

In some early ICL mainframe

Mainframe computer

Mainframes are powerful computers used primarily by corporate and governmental organizations for critical applications, bulk data processing such as census, industry and consumer statistics, enterprise resource planning, and financial transaction processing.The term originally referred to the...

 computers, a bang file was a temporary data storage file whose name began with a ! character (which is sometimes nicknamed "bang") and automatically deleted when the run or user session ended.