Portuguese to English Bus/Financial Investment / Securities Account statement summary

Good afternoon/evening,

This is my final question with regard to the above inquiry. Among the various itemized transactions, there is one as follows:
PROV * RESGATE CDB FLU [this is then followed by CDB/plus numbers, etc.].

I've already found out that RESGATE CDB refers to BANK DEPOSIT CERTIFICATE REDEMPTION, however, given that I need to translate all, I could not find FLU anywhere and even wonder if this might be neecessary.

If so, does anyone have an idea to what this may refer?

Thanks in advance.

Best regards,

Richie