PDI : SET lifted "H" sign from PDI The Stock Exchange of Thailand (SET) lifted "H" (HALT) sign from PDI's securities as from the second trading session of February 19, 1996 because material information has been disclosed by the company to the public through the exchange. Previously, the SET has posted "H" sign on PDI's securities in the first trading session of February 19, 1996 at 10.27 a.m. due to waiting for material information from the company.