Editorial Note: This article is written with editorial review and topic relevance in mind.
防爆标志ex d iic t6 gb是一个详细的电气设备防爆标识，它由多个部分组成。 ex是中国及国际电工委员会的防爆标志，表示该设备遵循gb3836和iec60079的防爆标准。 d代. But what is the origin of the usage as a prefix in the words. Google dictionary has this information about the origin of ex:
Ex 'Today' Staffer Says Matt Lauer Cheated on His Wife with Her He
Does ex have a full form? In writing, though, the use of former doesn't seem so rare.
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