ไบเซ็กส์ชวล / ไบเซ็กส์ฌวล
bai-sèk-chuwan
"(is) bisexual", Thai transcription of the English loanword
also note that the name of the symbol itself contains a silenced letter, ต, which makes the "dt" sound. it is a loanword from Sanskrit or Pali, I'm not sure which. :)