Hi Ralph,
My "Essential Dictionary of Music Notation" uses the terms
beat repetitions
measure repetitions
section repetitions
However, it has no special term for the symbol -- it simply describes
it in words: "This sign (%) is used..."
For the record, it also says "Do not use [beat repetitions] in
engraved music" and "In engraved music, [the use of single-measure
repetitions] should be limited to rhythm parts."
Hope this helps,
Kieren.
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