Cohen's d is an effect size statistic for t-tests. This version is for an independent-samples t test when equal variances are assumed. This is sometimes called Student's t-test or the classic t test.
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This version of the Cohen's effect size statistic uses pooled standard deviation in the denominator. Equal variances are assumed.
Suggested effect size interpretation (Sawilowsky, 2009):
These value labels are not meant to be absolute standards. The interpretation depends upon the research context.
Sawilowsky, S.S. (2009). New effect size rules of thumb. Journal of Modern Applied Statistical Methods. 8(2), 597-599. https://doi.org/10.22237/jmasm/1257035100
Wikipedia: Effect size
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