Univariate data

Univariate data is one column of values, one per individual, which is why the questions you ask of it are shape, center, spread, and unusual values. For example, the five quiz scores 6, 7, 8, 9, and 10 are univariate: the mean $\bar{x}$ (x-bar) is $40 / 5 = 8$, and there is no second variable to relate the scores to. Dotplots, histograms, stemplots, and boxplots are all univariate displays. Record a second measurement on the same individuals and you have bivariate data, where questions about relationships become possible.