Which renowned architectural firm's logo was designed by Pentagram and features an abstract representation of the firm's initials that also suggests architectural forms?

The architecture industry has some of the most recognizable logos and brand identities in the professional world. These symbols often carry deep meaning related to design principles, company history, or architectural philosophy. How well do you know the stories behind these iconic architectural brand identities? Test your knowledge of the visual language that defines the industry's most influential firms.

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Foster + Partners (with its distinctive '+' symbol that represents connection and collaboration)
OMA (Office for Metropolitan Architecture, with its bold square logo representing urban blocks)
SOM (Skidmore, Owings & Merrill, with its minimalist logo suggesting structural frameworks)
BIG (Bjarke Ingels Group, with its playful three-letter stacked logo suggesting building blocks)