Persian text file whose title means abbreviations used in mobile schematic reading, 5.34 KB, the same size as a similarly titled note and likely a duplicate copy. It lists the shorthand labels seen on phone circuit diagrams and board layouts, such as rail names, signal names and part prefixes. Any text editor will open it, provided it handles Persian characters in UTF-8. Use it as a general glossary for learning to read schematics, and verify terms against the specific manufacturer drawing, since naming conventions differ between brands.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @schematic_mobile5. Enginerys does not host this file.