nuvɔːgu is actually the incomplete IPA notation of the japanese pronounciation of 'new vogue' - incomplete because the stress indicator (as well as intonation markers) are missing, although I'm guessing the stress would be on the second syllable: [nuˈvɔːgu]. The [ɔ] signifies a specific way of pronouncing the letter 'o'. In this case it corresponds with the 'o' in words like 'not' or 'shot'. The weird little colon indicates stress on the preceding syllable.
There's a couple of bands who use(d) IPA in their bandnames: Act∫uə √èil (the only real IPA characters here being [∫] which corresponds to the 'sh' sound in words like 'shoot' or 'shine' and schwa [ə], c.f. separate. Another rather elaborate one would be:【zɔ́:diæ̀k】 - unsurprisingly the IPA form of a somewhat engrish pronounciation of the word 'zodiac' (which in AE would actually look like this: [ˈzoʊdiˌæk]; in BE like this: [ˈzəʊdɪæk].
AthanSmith reacted to VESSMIER in A Brief History of Visual Kei: Unnecessary Symbols & Punctuation in Band Names