eb ell ions ▁against ▁the ▁Russian ▁Empire <0x0A> </s> ▁The ▁open ▁front ▁un r ounded ▁v owel , ▁or ▁low ▁front ▁un r ounded ▁v owel , ▁is ▁a ▁type ▁of ▁v owel ▁sound , ▁used ▁in ▁some ▁spoken ▁languages . ▁It ▁is ▁one ▁of ▁the ▁eight ▁primary ▁cardinal ▁v ow els , ▁not ▁directly ▁intended ▁to ▁correspond ▁to ▁a ▁v owel ▁sound ▁of ▁a ▁specific ▁language ▁but ▁rather ▁to ▁serve ▁as ▁a ▁fundamental ▁reference ▁point ▁in ▁a ▁ph on etic ▁meas uring ▁system . ▁ ▁The ▁symbol ▁in ▁the ▁International ▁Ph on etic ▁Al phabet ▁( IP A ) ▁that ▁represents ▁this ▁sound ▁is ▁, ▁and ▁in ▁the ▁IP A ▁v owel ▁chart ▁it ▁is ▁position ed ▁at ▁the ▁lower - left ▁corner . ▁However , ▁the ▁accuracy ▁of ▁the ▁quad ril ater al ▁v owel ▁chart ▁is ▁disput ed , ▁and ▁the ▁sound ▁has ▁been ▁analyz ed ▁ac oust ically ▁as ▁extra - open ▁at ▁a ▁position ▁where ▁the ▁front / back ▁distinction ▁has ▁lost ▁its ▁significance . ▁There ▁are ▁also ▁differ ing ▁interpret ations ▁of ▁the ▁exact ▁quality ▁of ▁the ▁v owel : ▁the ▁classic ▁sound ▁recording ▁of ▁ ▁by ▁Daniel ▁Jones ▁is ▁slightly ▁more ▁front ▁but ▁not ▁quite ▁as ▁open ▁as ▁that ▁by ▁John ▁Well s . ▁ ▁In ▁practice , ▁it ▁is ▁considered ▁normal ▁by ▁many ▁ph on et icians ▁to ▁use ▁the ▁symbol ▁ ▁for ▁an ▁open ▁central ▁un r ounded ▁v owel ▁and ▁instead ▁approximate ▁the ▁open ▁front ▁un r ounded ▁v owel ▁with ▁ ▁(