Taipei: The Taiwan Stock Exchange's main index opened down 77.72 points at 27,447.45 Thursday on turnover of NT$9 billion (US$285.26 million).According to Focus Taiwan, the market experienced a decline as trading commenced for the day. The turnover reflects the initial trading activity and investor sentiment at the start of the session. This opening figure sets the tone for the day's market activities and highlights the fluctuations in investor confidence.