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An index (pl.: usually indexes, more rarely indices) is a list of words or phrases ('headings') and associated pointers ('locators') to where useful material relating to that heading can be found in a document or collection of documents. Examples are an index in the back matter of a book and an index that serves as a library catalog.
The plurals of the names of fishes either take the ending -s or is the same as the singular. Other nouns that have identical singular and plural forms include: craft (meaning 'vessel'), including aircraft, watercraft, spacecraft, hovercraft (but in the sense of a skill or art, the plural is regular, crafts)
For example, in Polish, the noun "oko", among other meanings, may refer to a human or animal eye or to a drop of oil on water. The plural of "oko" in the first meaning is "oczy" (even if actually referring to more than two eyes), while in the second it is "oka" (even if actually referring to exactly two drops).
The plural form of a foreign word may be modified to fit English norms more conveniently, like using "indexes" as the plural of index, rather than indices, as in Latin. The word "opera" (itself the plural form of the Latin word opus ) is understood in English to be a singular noun, so it has received an English plural form, "operas".
Examples are stewardi (supposed plural of stewardess) and Elvi (as a plural for Elvis imitators). The Toyota corporation has determined that their Prius model should have the plural form Prii, even though the Latin word prius has a plural priora, the Lada Priora having prior claim to that name—though the common plural is "Priuses".
When duplicated, as §§, it is read as the plural "sections". For example, "§§ 13–21" would be read as "sections 13 through 21", much as pp. (pages) is the plural of p., meaning page. It may also be used with footnotes when asterisk *, dagger †, and double dagger ‡ have already been used on a given page.
A price index (plural: "price indices" or "price indexes") is a normalized average (typically a weighted average) of price relatives for a given class of goods or services in a given region, during a given interval of time.
4 Grammaticality judgement: "I didn’t expect your mother to like the picture; but I did you."