A term for a hypercube this concept was featured in the whimsical book Wrinkle Time?

The term for a hypercube in Madeleine L'Engle's "A Wrinkle in Time" is tesseract.

A tesseract is a four-dimensional cube, and in the book, it's described as a "wrinkle" in space-time that allows Meg, Charles Wallace, and Calvin to travel to other planets and dimensions.