A flag pattern is a technical analysis chart pattern that can indicate a potential trend reversal. It consists of a short-term trend, followed by a period of consolidation or sideways movement. The trend and the consolidation period both generally occur over a relatively short time frame, typically a few weeks.

The pattern is called a "flag" because the consolidation period often looks like a rectangle, or flag, on the chart. The trend preceding the flag pattern is generally considered to be the "flagpole," and the consolidation period is the "flag." The flag pattern is considered a bullish reversal signal, indicating that the trend may be about to reverse from a downtrend to an uptrend.

A pole pattern is similar to a flag pattern, but the consolidation period is more elongated, with a steep slope up or down. Like the flag pattern, the pole pattern is considered a bullish reversal signal if the trend preceding the pattern is downward, and a bearish reversal signal if the trend preceding the pattern is upward.

It's important to note that these patterns are not always reliable indicators of a trend reversal, and should be confirmed with other technical analysis tools and indicators, such as trend lines, moving averages, and volume. It's also important to consider fundamental analysis, such as the financial health and industry conditions of the company whose stock you are analyzing.