In British Received Pronunciation, and most other non-rhotic (r-dropping) varieties of English, monosyllabic triphthongs with R are optionally distinguished from sequences with disyllabic realizations:
[aʊ̯ə̯] as in hour (compare with disyllabic "shower" [aʊ̯.ə]) [aɪ̯ə̯] as in fire (compare with disyllabic "higher" [aɪ̯.ə]) [ɔɪ̯ə̯] as in "loir" (compare with final disyllabic sequence in "employer" [ɔɪ̯.ə])
As [eɪ̯] and [əʊ̯] become [ɛə̯] and [ɔː] respectively before /r/, most instances of [eɪ̯.ə] and [əʊ̯.ə] are words with the suffix "-er".
Other instances are loanwords, such as boa.
[aʊ̯ə̯, aɪ̯ə̯, ɔɪ̯ə̯] are sometimes written with ⟨awə, ajə, ɔjə⟩, or similarly.
Do they mean actually acoustically or just notationally?
Secondly, why is the letter r capitalized ?
