* The Holy Trinity: As a Catholic institution, the Trinity (Father, Son, Holy Spirit) is paramount. The number 3 intrinsically connects to this central tenet of the faith, and its presence might be subconsciously or subtly emphasized in various architectural or symbolic elements around campus.
* Three-year programs: Historically, some programs at Notre Dame may have had three-year durations, although this is less common now. This could create a minor, historically based association.
* Architectural features: Some might point to architectural features appearing in threes (sets of three windows, columns, etc.) as potentially significant, although this isn't formally documented as intentional symbolism. Such observations are often subjective interpretations.
* Athletic traditions and superstitions: In the context of Notre Dame's famous football team, the number 3 might hold significance for individual players or fans based on personal experiences or superstitions, but this wouldn't be a university-wide, official connection.
In short, while the number 3 isn't explicitly declared as having a specific, overarching symbolic meaning at Notre Dame, its connection to the Holy Trinity and potential subtle appearances in architectural and historical contexts allow for interpretation and association with the university's religious foundation. However, there's no official declaration or established tradition assigning a particular, unique meaning to the number 3 at Notre Dame.