Larger 697 KB PDF relating to the 1N4001 rectifier, filed in the schematic category. The double plus in the name gives no clear information, so it may be an extended sheet, a family document or a compilation; open it to see what is covered. The 1N4001 is the 50 V, 1 A part of the 1N400x series. Such documents supply ratings, curves and package outlines that technicians use to verify markings, test diodes out of circuit and pick replacements with adequate voltage and surge margins.
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 @cyberlanelectonik. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.