What does IR mean in Unclassified?

This page is about the meanings of the acronym/abbreviation/shorthand IR in the Miscellaneous field in general and in the Unclassified terminology in particular.

Impact Resistant

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Definition

What does IR mean?

iridium, Ir, atomic number 77(noun)
a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium

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"IR." Abbreviations.com. STANDS4 LLC, 2015. Web. 19 Apr. 2015. <http://www.abbreviations.com/term/351353>.