Saṅkarṣaṇa—one of the four original expansions of Lord Kṛṣṇa in the spiritual world; also, another name of Balarāma, given by Garga Muni.

Saṅkarsana-one of the four original expansions of Lord Krsna in the spiritual world; also, another name of Balarama, given by Garga Muni.
 

Link to this page: https://prabhupadabooks.com/glossary/s/sankarsana-one-of-the-four-original-expansions-of-lord-krsna