an interruption or temporary suspension of progress or movement; "a halt in the arms race"; "a nuclear freeze"
A halt is an interruption in trading of a certain security. For MovieStocks, halting always occurs the day of a film's wide release. Trading resumes when estimates of the box-office numbers for the opening weekend are released. For StarBonds, halting occurs the day their credited MovieStock is cash out from the Exchange.
An issue is halted when it is temporarily halted from trading, usually for 30 minutes, during the time when news from the issuing company is being disseminated over the news wires. A trading halt gives investors an equal opportunity to evaluate news and make their buy, sell and hold decisions accordingly. A trading halt may also be imposed for purely regulatory reasons, either by the Nasdaq Stock Market or an exchange.