Final answer:
The symbol of alumni varies by institution, with no universal symbol. Some use a silver key, gold rose, yellow rose, or blue scroll, each having its own institutional significance.
Step-by-step explanation:
The symbol of alumni is often a matter of tradition and can vary from one institution to another. While there is no single universal symbol for all alumni, some organizations and institutions may choose specific icons to represent their graduates. For example, a silver key can sometimes symbolize access to knowledge or entry into a society of educated individuals. In contrast, a gold rose or yellow rose can represent success and achievement, or the blossoming of one's career following education, and a blue scroll can serve as a symbol of academic accomplishment. However, without context to a specific institution or organization, this question does not have a definitive answer. Therefore, it's essential to refer to the specific symbols associated with a particular alumni group.