What is the feature numbered 2 in this photograph? 
Definitions:
Line Chart
A type of graph that depicts information as a series of data points connected by straight line segments, often used to show trends over time.
Pictograph
A written symbol that represents an idea or object rather than a word, used in ancient writing systems and also in modern infographics.
Picture Units
The smallest element of a picture or image that can be individually processed in a digital display system.
Stacked Bar
A bar chart that represents multiple data series stacked on top of each other, showcasing the total and individual contribution of each series.
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