The middle of the three traditional angelic hierarchies, consisting of Dominions, Virtues, and Powers.
The Second Hierarchy contains the Dominions, Virtues, and Powers. Medieval theology associates these orders with the governance and ordering of divine ministrations.
Etymology
Hierarchy from Greek hierarchia, “sacred rule.”
Sculptor Notes
Unlike Michael, Gabriel, or Raphael, these orders rarely have universally fixed sculptural attributes. Identification therefore depends heavily on inscriptions, ensemble context, heraldic-like attributes, or an established iconographic program.
References
https://www.newadvent.org/summa/1108.htm