▁Old ▁High ▁German ; ▁by ▁ 9 0 0 , ▁its ▁effects ▁are ▁consist ently ▁visible ▁only ▁in ▁the ▁sp elling ▁of ▁German ic ▁*/ a /. ▁ ▁Other ▁languages ▁I - mut ation ▁exists ▁in ▁many ▁other ▁languages ▁but ▁is ▁often ▁referred ▁to ▁by ▁different ▁names . ▁However , ▁in ▁the ▁Rom ance ▁languages , ▁it ▁is ▁more ▁commonly ▁called ▁met aph ony ▁( from ▁An cient ▁Greek , ▁meaning ▁" process ▁of ▁changing ▁sounds ", ▁of ▁which ▁German ▁um la ut ▁is ▁a ▁translation ). ▁Meanwhile , ▁in ▁C elt ic ▁languages , ▁it ▁is ▁referred ▁to ▁as ▁affection . ▁A ▁type ▁of ▁i - mut ation ▁is ▁also ▁observed ▁in ▁An atol ian ▁languages , ▁including ▁H itt ite , ▁Lu w ian , ▁Ly cian ▁and ▁L yd ian . ▁ ▁Korean ▁language ▁▁ ▁In ▁Middle ▁Korean , ▁I - back ward - sequ enced ▁v ow els ▁( <0xE3> <0x85> <0x90> , ▁ <0xE3> <0x85> <0x94> , ▁ <0xE3> <0x85> <0x9A> , ▁ <0xE3> <0x85> <0x9F> , ▁ <0xE3> <0x85> <0xA2> , ▁...) ▁were ▁di ph th ongs , ▁i . e . ▁ <0xE3> <0x85> <0x90> ▁[ aj ], ▁ <0xE3> <0x85> <0x94> ▁[ ə j ], ▁ <0xE3> <0x85> <0x9A> ▁[ oj ], ▁ <0xE3> <0x85> <0x9F> ▁[ uj ], ▁ <0xE3> <0x85> <0xA2> ▁[ ɯ j ▁~ ▁ <0xC9> <0xB0> i ]. ▁However , ▁in ▁early ▁modern ▁Korean , ▁they ▁are ▁mon oph th ong ized ▁by ▁um la ut , ▁i . e .