o·gon·ek 
(ə-gônĕk, -gŏn-)
(ə-gônĕk, -gŏn-)n.
A mark resembling a hook (˛) placed beneath a letter, usually to indicate nasalization, as in Polish, or sometimes vowel length, as in Lithuanian.
[Polish, from diminutive of ogon, tail, from Proto-Slavic *ogonŭ (probably originally "that which drives away (flies and the like)") : *o-, ob-, around, on + *goniti, to push, chase, drive.]