What is vexilla?

Some articles on vexilla:

Vexillum
... The vexillum ( /vɛkˈsɪləm/ plural vexilla) was a flag-like object used in the Classical Era of the Roman Empire ... historical evidence (from coins and sculpture) that vexilla were literally "little sails" i.e ... all of the present-day regions of Italy preserve the use of vexilla ...
Vexilla Regis - References in Later Works
... Franz Liszt wrote a piece for solo piano, Vexilla regis prodeunt, S185, and the pentatonal theme is used throughout Via Crucis (The 14 stations of the Cross), S504a ... first part of The Divine Comedy, Virgilius introduces Lucifer with the Latin phrase Vexilla regis prodeunt inferni ... Gustav Holst used both the words and the plainchant melody of Vexilla regis in his Hymn of Jesus (1917) ...
Vexilla Regis
... The "Vexilla Regis" is a Latin hymn by the Christian poet Venantius Fortunatus, Bishop of Poitiers ... It takes its title from its opening stanza Vexilla regis prodeunt, fulget crucis mysterium, quo carne carnis conditor suspensus est patibulo ... "Vexilla" has been interpreted symbolically to represent baptism, the Eucharist, and the other sacraments ...
Vexillatio
... standards carried by legionary detachments, vexillum (plural vexilla), which bore the emblem and name of the parent legion ... cohortes and centuriae, and cavalry alae and turmae, may have had their own vexilla ... In addition, vexillationes with their own vexilla would have designated companies of special troops outside the usual military structure, such as vexillarii (re-enlisted veterans), who may ...