Square icon (geometric form) missing !

Hi! I'm a teacher, and while looking for basic geometric shapes (in the "Color" style), I noticed you have triangle, circle, rectangle, etc. but surprisingly, no square! There is a rhombus icon (https://icons8.com/icon/13379/rhombus ), but it's not really intuitive as a substitute. If someone could simply rotate it to make it a regular square while keeping the same style, that would be perfect. The geometric forms are listed here under the "Forms" section. You'll see there is no square! Thanks a lot!