The phrase identifies a specific type of document: a PDF file detailing the symbolic significance of the vestments worn by the High Priest in ancient Israel. These documents typically explore the religious and cultural meanings embedded within each article of clothing, from the breastplate to the turban.
Studying the symbolism of these garments offers insight into the religious worldview, social hierarchy, and ritual practices of the ancient Israelites. Such analysis illuminates the spiritual role of the High Priest as mediator between God and the people, and provides valuable context for understanding related biblical texts and historical interpretations.