Bear Market Rally
  
A bear market rally is a short period where the market prices rise, even though the market has been low recently. It's also sometimes known as a "sucker rally," because people sometimes think "Hey, the stocks are going up!" and buy up accordingly...not realizing it's just a little blip and likely not to last. Sometimes the rally only lasts a few days, sometimes a few months.
There's no official percentage defined anywhere, but, generally, an increase of 5 percent or more during a bear market counts as a rally.