What does RFZ mean in Music?

rinforzando

A variety of musical terms are likely to be encountered in printed scores, music reviews, and program notes. Most of the terms are Italian, in accordance with the Italian origins of many European musical conventions. Sometimes, the special musical meanings of these phrases differ from the original or current Italian meanings. Most of the other terms are taken from French and German, indicated by Fr. and Ger., respectively. Unless specified, the terms are Italian or English. The list can never be complete: some terms are common, and others are used only occasionally, and new ones are coined from time to time. Some composers prefer terms from their own language rather than the standard terms listed here.

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