a paper used to make copies
A sheet of carbon paper, with the coating side down Handwriting duplicated through carbon paper
Carbon paper (originally carbonic paper) consists of sheets of paper that create one or more copies simultaneously with the creation of an original document when inscribed by a typewriter or ballpoint pen. The email term cc, which stands for "carbon copy", is derived from this use of carbon paper.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).