Trademark is a intellectual property consisting of a recognizable sign, design, or expression which identifies products or services of a particular source from those of others.
ISO is a worldwide federation of national standards bodies. It is a nongovernmental organization that comprises standards bodies from more than 160 countries, with one standards body representing each member country.
Pf is provident fund, ESI is Employee state insurance. PF is aimed to benefit any person who is unemployed for 60 days. Esi is insurance benefit that has Sickness and other benefits.