Readymix logo geoglyph

The Readymix logo geoglyph is a large geoglyph of the Readymix logo carved into the ground of the Nullarbor Plain about 13 kilometres (8.1 mi) north west of Caiguna, Western Australia. At the time of its creation the Readymix logo geoglyph was the largest such signage of its kind, and appeared in the Guinness Book of Records between 1972 and 1991, first as the world's largest advertising sign and, later, as the world's largest letters. The 3.2 kilometres (2.0 mi) wide, 1.6 kilometres (0.99 mi) tall logo consists of the words "READYMIX" surrounded by a diamond. Each letter is 240 metres (790 ft) high by 180 metres (590 ft) wide, with a line thickness of 12 metres (39 ft).

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