A functional, space-efficient default fallback or embedded CID-keyed font —excellent for technical documents and CJK text, but visually generic for design work.
If you see cidfont f1 missing in a PDF, extract the original font (e.g., using pdffonts on Linux or Acrobat Pro) – it's likely a standard system font renamed. Re-embed the full font family for editing. cidfont f1
If you are looking for the specific string cidfont f1 in a research context, it is highly likely a rather than a standard academic term. extract the original font (e.g.
"The PASCAL Visual Object Classes (VOC) Challenge" cidfont f1