Instantly recognisable logos...

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I was having a bit of a think the other day (and a sit down, can't do two things at once).

Which is the most instantly recognisble logo, and why? I think that some of the following are probably contenders, and they're all quite simple designs:







The BR one is less ubiqutous than it used to be, but still obvious what it is. The Nazi flag one, despite it's unpleasant associations, is also instantly recognsiable and unmistakeable.

Any others that you can think of?

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A couple more I'd forgotten:

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Glocko said:

A prize (pat on the back) for the first to identify this one!

Is it Corus/British Steel? Ah, having Googled, no.

I recognise it but can't remember it.

Some sort of shipping line?