名詞 insignia:

1. a badge worn to show official position

1. The costume or insignia worn by the retainers of a feudal lord.
   裝束封建主的隨從所穿的服裝或所戴標志
2. A device or emblem worn as an insignia of rank, office, or membership in an organization.
   徽章一種作為軍銜、官銜或某一組織中會員的標志而佩帶的圖案或符號
3. Insignia, as of a state, an official, a family, or an organization.
   (如國家，官員，家庭或組織的)徽章
4. A medal, emblem, or insignia in the form of an upright post with a transverse piece near the top of it, or a modification thereto.
   十字勛章用接近頂部的地方橫梁上的一根立柱的形狀制成的勛章或徽章或由此加以裝飾的飾物

in.sig.ni.a

n.（名詞）
【復數(shù)】 insignia 或 in.sig.ni.as
A badge of office, rank, membership, or nationality; an emblem.
證章，識別符號：職位、等級、會員或國籍的證章；象征
A distinguishing sign.
標記：突出的記號

來源：
Latin onsignia [pl. of] onsigne [badge of office, mark] [from neuter of] onsignis [distinguished, marked]
拉丁語 onsignia [] onsigne的復數(shù) [職位的證章，標記] [] 源自onsignis的中性詞 [突出的，標記的]
in- [in] * see in- 2
in- [在里面] *參見 in-2
signum [sign] * see sek w-
signum [符號，記號] *參見 sek w-

Insignia in Latin is the plural form of insigne, but it has long been used in English as both a singular and a plural form:
Insignia 在拉丁語中是 insigne 的復數(shù)形式， 但是在英語中很長時間來一直既被用作單數(shù)又被用作復數(shù)形式：
例句：
The insignia was visible on the wingtip.
翼梢上的徽記清晰可見。

例句：
There are five insignia on various parts of the plane.
在飛機的不同部分有五個徽記。

From the singular use ofinsignia comes the plural insignias, which is also common in reputable writing.The Latin singularinsigne is rare and may strike some readers as pedantic.
從insignia 的單數(shù)用法衍生到復數(shù)用法 inisiguias ， 這種用法在規(guī)范的寫作中也很常見。拉丁語的單數(shù)形式insigue 很罕見， 這可能會使一些讀者認為是在賣弄學問