Vexillum
Vexillum , noun
[Latin, a standard, a flag.]
1.
(a) (Rom. Antiquities) A flag or standard.
(b)
(Rom. Antiquities) A company of troops serving under one standard.
2.
(a) (Ecclesiastical) A banner.
(b)
(Ecclesiastical) The sign of the cross.
3.
(Botany) The upper petal of a papilionaceous flower; the standard.
4.
(Zoology) The rhachis and web of a feather taken together; the vane.