Where is this sample or sound from?

Hi all,

Does anybody know where this sound/sample comes from in klangkuenstlers latest track "Satisfaction"? https://youtu.be/DiZPu9u_rCc?t=203 in the break starting at 3:22, the e-e-e-e-a riff repeating many times in the break. I believe it is a very famouse old school sound/riff, but I can't find it. What would be the name for the sound? Strings? Please help. Thank you very much in advance.

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