President Obama had never blatantly expressed support for allowance of same-sex marriages in the United States, leaving his position in a bit of a flimsy, wishy-washy grey area.

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Like Airbnb, EatWith and other dinner-hosting start-ups operate in a grey area of the law.

BBC: Would you eat in a stranger's home?

Another grey area is beefing up anti-terror laws: experts are not sure whether India needs new laws.

BBC: Will India's security overhaul work?

Labour wants to bring clarity to what it says is the "grey and murky" area of financial crime - although its opponents say the party was responsible for introducing the "light touch" regulation of the City that allowed fraud to flourish.

BBC: UK Politics

E-cigarettes currently fall into a regulatory grey area.

CNN: Sales of e-cigarettes continue to soar

Once food is processed - and this can mean as little as sprinkling salt on a lamb chop - what exactly can be called country of origin becomes a grey area.

BBC: Last Updated: Friday, 4 March 2005, 17:15 GMT

The idea of a black-and-white regulation sounds good, but any kind of litigation goes into the grey area because no one knows where the line really is.

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Russia's natural resources minister Jurij Trutnev, meanwhile, has been making optimistic noises in recent weeks about the likelihood of a resolution of a long-standing border dispute between the two nations over a 155, 000 square kilometres "grey area" in the Barents Sea.

BBC: Arctic landscape