Found this on the net:
Soon after the 26 December tsunamis in 2004, Unilever unveiled a new logo - a series of symbols depicting life and values, all of which combine in a large U. The concept was developed in-house by Sri Lanka's Lowe LDB over one weekend, "when people were still trying to piece together their thoughts and spirits," says Lowe LDB Chairman, Lilamani Dias Benson.
The campaign was, she adds, a reflection of the empathy between client and agency. "The visual elements were these symbols and all it did was to suggest that 'U' can make a difference."
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Unilever logo symbolism:
Update (15th May 2009) - "