The Unicode people are probably going to standardize on calling it "diacritic folding", by analogy to the term "case folding".
Añd whàt shåll wë câll thë ãddítiõn of dîacrìtícs bÿ spämmêrs, ïñ ân ättëmpt tò fóòl spåm fîltêrs?
-- Curtis Clark http://www.csupomona.edu/~jcclark/ Web Coordinator, Cal Poly Pomona +1 909 979 6371 Professor, Biological Sciences +1 909 869 4062