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Re:Ask HN: What's the story behind Bruce Schneier and squids? by jdan on Friday December 01, 2017 @09:42PM (#15829799)
One theory is that it is his way of signaling. (source: https://www.quora.com/Whats-with-Bruce-Schneier-and-squids)

My guess is that he just likes squids, and it is sometimes it is important to step back and do something that isn't super-serious once in a while.