It should be "refers" because the emblem is singular. The confusion lies in the plural form of "stars" which lead one to want to say the plural form of "refer". The best way to see that is to replace the "three stars" with the word "emblem".

When to use refers or refer?

If you refer to a particular subject or person, you talk about them or mention them. If you refer to someone or something as a particular thing, you use a particular word, expression, or name to mention or describe them. If a word refers to a particular thing, situation, or idea, it describes it in some way.

Is refer singular or plural?

The noun referral can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be referral. However, in more specific contexts, the plural form can also be referrals e.g. in reference to various types of referrals or a collection of referrals.