Next time you run pdffonts and see CIDFont+F1 staring back at you, you will know exactly what it is: a ghost in the machine, a necessary evil, and a fascinating glimpse into the history of multilingual digital text.
In a PDF object representation:
to handle fonts with massive character sets, specifically for East Asian languages (Chinese, Japanese, and Korean) that require thousands of glyphs The "F1" Mapping: cid font f1 family
usually refers to the first font in the document's internal resource list. Character Identifier (CID): The "CID" prefix stands for Character Identifier . This technology was developed by Next time you run pdffonts and see CIDFont+F1
The CID font F1 family is widely used in various applications, including: a necessary evil