Left blue means "science and truth"
Right white or silver means "loyalty"
The general meaning of the keys is"
This expresses power over the faithful, derived from the religious origin of the Keys of Peter, but according to an official heraldic page it means "trust, silence, helpfulness". Other sources also suggest meanings such as "authority, stewardship, security, and the power to unlock or bind", while keys pointing down specifically can add nuances like "humility, readiness for use, or a lower/base position".
