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Explanation: As so often, the German term describes the technology, whilst the English term describes the product:
"Alarm glass: A particular form of laminated glass used for security purposes. The glass has 0.1 mm wires embedded in the interlayer (intermediate layer between the outer glass sheets). The wires form an electrical circuit which, if broken in the event of the glass sheet being smashed, sets off an alarm."
Ref 1 (search the file for 'alarm glass')
Is a special laminated glass designed and manufactured for security purposes. The interlayer is embedded with a very thin wire and then "sandwiched" between two or more sheets of glass. The wire forms an electrical circuit which activates alarm when the glass is forced."