A trading halt is when the buying and selling of a particular stock or investment is temporarily stopped. It is usually done to allow for important news or information to be released or to prevent extreme price fluctuations. Full definition
Such language is commonly found in Chinese trading halt announcements. (breakingviews.com)
However, all markets on the trading floor shall be limited to trading at these price levels (locked limit) and shall not constitute a Triggering Event for purposes of a Temporary Trading Halt on Globex. (cannontrading.com)
IIROC's new policy would see trading halted for five minutes for TSX - listed shares if a stock increased or decreased by either 10 % or 10 trading increments (whichever is greater) in the span of five minutes. (moneysense.ca)