The Nomen Mysticum is the secret name that a member of a mystical secret society is given once they are considered a worthy and confirmed member of a specific mystical order.
Contents
Initiation
Usually the secret name is not given to the neophyte directly, but only after the completion of initiation.
The connection between the initiation and the presentation of a secret name is considered a rite of passage by most esoteric orders. It is understood that this process represents the mystery of rebirth (or birth - death - rebirth).
Famous secret names
Christian Rosenkreuz
Christian Rosenkreuz is believed by many to be the secret name of Francis Bacon. This is also the position of Ancient Mystical Order Rosae Crucis.
References
Nomen mysticum Wikipedia(Text) CC BY-SA