The three short-vowel marks are collectively called ḥarakāt: fatḥah (a), kasrah (i), and ḍammah (u). Changing the vowel changes pronunciation, and in some forms it also changes grammatical meaning.
Word / formMeaning / explanation
بَba, with fatḥah.
بِbi, with kasrah.
بُbu, with ḍammah.
In morphology, vowel descriptions are not merely reading aids: they often help distinguish one form or pattern from another.