CID (Character ID) fonts are a technology used to handle complex character sets, such as those found in Asian languages (Chinese, Japanese, Korean) or multi-lingual documents.
Understanding CID Fonts (F1, F2, F3, F4) and Why You Can't Download Them cid font f1 f2 f3 f4 free link download
The direct answer is that It is a placeholder or internal reference name generated by PDF export software when the original fonts are not properly embedded. What are CID Fonts? CID (Character ID) fonts are a technology used