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In page Ukrainian language:

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The letter щ represents two consonants [ʃt͡ʃ]. The combination of [j] with some of the vowels is also represented by a single letter ([ja] = я, [je] = є, [ji] or [jı̽] = ї, [ju] = ю), while [jɔ] = йо and the rare regional [jɨ] = йи are written using two letters. These iotated vowel letters and a special soft sign change a preceding consonant from hard to soft. An apostrophe is used to indicate the hardness of the sound in the cases when normally the vowel would change the consonant to soft; in other words, it functions like the yer in the Russian alphabet.[citation needed]