⟨bb⟩ is used in Pinyin for /b/ in languages such as Yi, where b stands for /p/. In English, doubling a letter indicates that the previous vowel is short (so bb represents /b/). In ISO romanized Korean, it is used for the fortis sound /p͈/, otherwise spelled ⟨pp⟩; an example is hobbang. In Hadza it is the rare /pʼ/.
⟨bd⟩ is used in English orthography for /d/ in a few words of Greek origin, such as bdellatomy. When not initial, it represents /bd/, as in abdicate.
⟨bh⟩ is used in transcriptions of Indo-Aryan languages for a murmured voiced bilabial plosive (/bʱ/). In Irish orthography, it stands for the phonemes /w/ and /vʲ/, for example mo bhád /mə waːd̪ˠ/ ('my boat'), bheadh /vʲɛx/ ('would be'). In the orthography used in Guinea before 1985, ⟨bh⟩ was used in Pular (a Fula language) for the voiced bilabial implosive /ɓ/, whereas in Xhosa, Zulu, and Shona, ⟨b⟩ represents the implosive and ⟨bh⟩ represents the plosive /b/.
⟨bp⟩ is used in Sandawe and romanized Thai for /p/, and in Irish it represents /b/.
⟨bz⟩ is used in the Shona language for a whistled sibilant cluster /bz͎/.
Read more about this topic: Lj (digraph)