Definition of #ashtag

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The cloud of volcanic ash drifting southwards from a volcano in Iceland, April 2010

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A cloud of volcanic ash from Iceland

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Where you write your name to stake your claim on your stash

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Used to mark topics related to Ash Wednesday (the beginning of Lent in the Roman Catholic Church).

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I thought it was just "Hashtag" but using # as the "H". Oops...