tasa de intermediación interbancaria de equilibrio (TIIE)
English translation: balance interbank interest rate
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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
Spanish term or phrase:
tasa de intermediacion interbancaria de equilibrio (TIIE)
Explanation: The same abbreviation is used in English, as in the first website below and many others.
The second website uses the term
"BALANCE INTERBANK INTEREST RATE". In your case, I would use TIIE and add a note giving the English expression as an explanation, in case the reader is not familiar with the term.