Could we change the title of this sub-stack, as well as the image which seems to hype a five-fold cross-validation strategy?

Validation is not inherently tied to repetition over folds. Considering the hundreds of "unanswered" questions tagged with [cross-validation] (meaning no answer is either up-voted or accepted), I propose the following new design:

Name: Statistics

Symbol: A Cauchy pdf overlaid with Gaussian, showing fat tails of former.