What is the term for a hypercube featured in the book 'A Wrinkle in Time'?
The scientific term is a tesseract, or a wrinkle in time, hence the title.
Because when they travel via tesseract they are using the fifth dimension which is a wrinkle which lets them travel long distances in a very short time. This basically creates a wrinkle in time hence the title. At the end of the book, the Mrs. Ws create a time wrinkle to cover up the fact that they were gone for many days.