Which architectural firm is known for its signature 'diagrid' structural system that creates distinctive diamond patterns on building exteriors, as seen in projects like 30 St Mary Axe (The Gherkin) in London?

In architectural product design, distinctive elements often become signature brand identifiers that communicate a firm's design philosophy and approach. These elements can range from specific materials to structural innovations that become immediately recognizable. This trivia question explores how certain architectural firms have created strong brand identities through consistent design elements that have become their visual trademarks in the built environment.

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Foster + Partners
Zaha Hadid Architects
Bjarke Ingels Group (BIG)
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