The term "690th" refers to the ordinal number that comes after 689 and before 691. It is used to indicate the position of an item in a sequence, such as in a list or ranking. For example, if a student ranks 690th in their class, it means there are 689 students who performed better. In various contexts, the number 690 can also represent specific events or milestones. For instance, it could refer to the 690th anniversary of a historical event or the 690th edition of a publication. Such designations help in organizing and categorizing information for easier reference.