The name "Microsporidium" is also used as a catchall genus for incertae sedis members. The term is not used as a catchall to cover ignorance. Cryptograms and extras, as well as catchall categories for rule-breaking puzzles, were added later. The original Latin term for shearwaters was usually the catchall name for sea-birds, "mergus". The word, 'referendum' is often a catchall, used for both legislative referrals and initiatives. The name "Knockouts" as a catchall name for the women stuck after that. Over decades, it became used as a catchall label for the Kivutian Tutsi. Catchall is a hamlet in west Cornwall, England, UK. It is still a catchall for most small pyramidellids lacking both axial and spiral sculpture.