What is Memo for XML (Stellar), BNB, EOS and Nexo BEP2 deposits?

This information comes directly from Nexo's help center

When you click on “Top-up” button next to Stellar (XLM), BNB, EOS or Nexo (BEP2) position on your Nexo account a respective deposit address including a unique ‘Memo’ will be automatically created.

This Memo is an extra piece of information that has to be included when sending a Stellar (XLM), BNB, EOS and Nexo BEP2 to your Nexo account.

The Memo is used to determine to which account a given transaction should be assigned and credited to. The Memo is numerical (7 digits) and has to be included with all XLM, BNB, EOS, Nexo BEP2 deposits to your Nexo account.
An example Memo is:

2034567

Please, always ensure to include the correct Memo before transferring your XLM, BNB, EOS and Nexo BEP2 to your Nexo account. Leaving out this information will lead to significant delays in crediting the transaction to your account, and can be irretrievable in some instances.