Type: font metric
    Extension: afm
      Version: 4.0
  Compression: None
  Color Depth: N/A
   Maintainer: Adobe Systems
Specification: ftp://ftp.adobe.com/pub/adobe/DeveloperSupport/TechNotes/PSfiles/5004.AFM_Spec.ps

AFM is Adobe's ASCII-based file format used for storing font metric data as
human-readable data. AFM is the standard Adobe font file format.

This format is also known as the Adobe Multiple Font Metrics (AMFM) and
Adobe Composite Font Metrics (ACFM) file formats. In fact, AFM, AMFM, and
ACFM are actually three variations of the same format. AFM files contain
base or composite font information. One AFM file is used per master design
of a font.  AMFM files store control and global font information for a
group of AFM files. And ACFM files contain the global metrics of the
composite font program.

The specification for the AFM format is:

  Adobe Font Metrics File Format Specification (Version 4.0),
    Adobe Developer Support, 14 February 1992, P/N LPS5004.
   
This document available via FTP as a Tech Note in PostScript format, or as
hardcopy when obtained directly from Adobe (see the PostScript section for
information on how to contact Adobe Systems, Inc.).