The words which convey the sense of reciprocation are called Reciprocal Pronouns.

Pairing the words one another and each other creates a sense of reciprocation. Therefore, they are Reciprocal Pronouns.

Examples:

• Two bulls wounded each other with their horn in a fight.
• We should all help one another in time of need.

Each other creates reciprocation between two nouns. One another creates reciprocation among more than two nouns.