I think you're referring to Correlation. This means the relationship between two variables. There can be a positive correlation, where as one variable increases, so does the other. There can be a negative correlation, where as one variable increases, the other decreases. Lastly, there can be no correlation, where there is no relationship between the two variables.
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Line Graph.
Line Graph
A call graph is a directed graph representing relationships between called and calling subroutines in a computer programme, as used in code analysis.
A Bar Graph!
sometimes I guess but they would be weird if you were trying to show them to your partner.