It commonly represents the voiced bilabial plosive /b/, like the English pronunciation of ⟨b⟩ in "ball".
The Russian small letter б (be) is similar (but not identical) in shape to the digit 6.
In Serbian and Macedonian the italic form is allowed to vary, but the regular should look like in other languages.
In Macedonian, the letter represents the sound /b/, but if it is in the final position of the word, it is pronounced as /p/, like in леб /lɛp/ ('bread').
In Serbian, the letter represents the voiced bilabial plosive /b/, regardless of the position in the word.