The Tau coefficient of correlation is a measure of association between paired data sets, which is widely used in statistics. However, there are several synonyms or alternative names for this important statistic. For instance, the Kendall rank correlation coefficient is also a type of Tau coefficient, which measures the concordance between two ranked variables. Meanwhile, the Somers' D statistic is another Tau coefficient that is commonly used in binary response data, where one variable is binary and the other is ordinal. Besides, the Goodman-Kruskal gamma statistic is sometimes called the Tau b coefficient, which measures the association between two binary variables. Overall, these synonyms or alternative names for Tau coefficient reflect the various types of data and research questions that this correlation measure can address.