The royal cypher, designed by the College of Arms, will replace Queen Elizabeth II's monogram on official buildings, postboxes and passports in the UK.
King Charles III's recently unveiled cypher consists of the letters C and R – C representing his first name and R for Rex, the word king in Latin.
The crown seen in Charles' cypher was also used in King George VI's monogram and is known as the Tudor Crown.
Other stories in the latest newsletter included Fala Atelier's garden apartment for a home in Porto, Studio Dennis Vanderbroeck's inflatable sculpture at Milan Fashion week and Foster + Partners' skyscrapers in Shenzhen connected by an open-air suspension bridge.
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