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Ogonek has been added to the Oxford English Dictionary, a statement that requires explanation: The word has been added to the electronic corpus, not to any specific print dictionary.
You can probably search OED Online through your library, but for the hell of it, here’s the entry (emphasis added):
A diacritic resembling a hook ( ̨), which is placed beneath a letter.
The ogonek is used in Polish to indicate nasalization of a vowel; the diacritic also occurs in some other languages, typically (but not always) with this function.
1981 Yellow Bk. (Internat. Telecomm. Union) 80 Capital U with ogonek. 1995 F. DE LAGUNA Tales from Dena IV. 78 An ogonek or hook ( ̨̨) under a vowel indicates that it is nasalized. 2002 A. TWARDOCH in J. D. Berry Lang. Culture Type 155 In uppercase Ę, ogonek should be attached at the baseline near the right part of the baseline stroke. 2006 Globe & Mail (Toronto) (Nexis) 19 July, A few manual typewriters, including..an Olympia Monica with a standard QWERTY keyboard supplemented by exotic Polish diacritics such as the kreska, ogonek and superior dot.