Reciprocal pronouns are words that are used to indicate a mutual relationship between two subjects or objects. ‘Each other’ and ‘one another’ are the only two reciprocal pronouns in the English language. These types of pronouns are used to indicate that two or more people have carried out some type of action, where all parties involved received the consequences or benefits of that action.
Examples :
Each other - Roshan and Ross love each other.
One another - My brother and my cousin were blaming one another.