ISI mark is a certification mark for industrial products in India. The mark certifies that a product confirms to the Indian Standard,mentioned as IS:xxxx.PubMed Central® (PMC) is a free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library. PubMed is a free search engine accessing primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics.
Hello Dr.Ravikant... What c refers here is ISI Web of knowledge database... Not merely the Indian standard certification mark... It's just a database just like Scopus, PUBMED, Cochrane, lilacs, embase etc...