ь and '
In addition to the vowels and consonants listed above, the Ukrainian alphabet contains the letter Ь ь ("м'який знак", "soft sign"), which produces no sound, but palatalizes ("softens") the preceding consonant.
Ukrainian consonants are also palatalized before vowels Є є, I i, Ю ю, Я я:
To prevent palatalization, we use the apostrophe ':
комп'ютер / kompiutercomputer