What's an Invitation Code? October 28, 2020 21:24 Updated An Invitation Code is used by schools that use picture passwords and are not rostered (see What’s a rostered school?). Invitation Codes are just one way to add or transfer students. Learn how they work in How do I add students to my class? Related articles How do I create classes and add students (non-rostered)? How can I tell if my school is rostered and what does that mean? How do students get started on ST Math? Introducing ST Math to Your Students How do I create a class?