how do you call un collier pour badge in english

In English, “un collier pour badge” is usually “a badge lanyard” or simply “a lanyard.”

Common wording

• Badge lanyard : the most specific and natural term for the cord worn around the neck with a badge holder.

• Lanyard : common if the context already makes it clear it’s for a badge.

Example

• “Could you give me a badge lanyard?”

Small note

If you mean the plastic holder itself, English speakers may say badge holder instead.