Flag: A flag is a small rectangle pattern that slopes against the previous trend. If the previous move was up, then the flag would slope down. If the move was down, then the flag would slope up. Because flags are usually too short in duration to actually have reaction highs and lows, the price action just needs to be contained within two parallel trend lines.

 

http://stockcharts.com/school/doku.php?id=chart_school:chart_analysis:chart_patterns:flag_pennant_continu

 

Hewlett-Packard Co. (HPQ) Pennant example chart from StockCharts.com