Which architectural firm famously incorporated its distinctive 'diagrid' (diagonal grid) exterior structural system as a brand signature that has significantly increased its global recognition?

In the world of architecture, certain firms have developed such distinctive styles that their buildings are instantly recognizable worldwide. These signature approaches have become powerful branding tools, increasing the value and recognition of both the architectural practices and the buildings they design. This trivia question tests your knowledge of how certain architectural elements have become synonymous with specific high-profile architects and their brand identity.

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Foster + Partners
Zaha Hadid Architects
Bjarke Ingels Group (BIG)
Renzo Piano Building Workshop