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"Myself and Clive's family and friends are heartbroken about the loss of him. You can never put a pound sign on anybody's life."

In the distance: a brick castle labeled “FORTRESS OF SOLITUDE,” decorated with a hypnotic swirl of dollar, euro and pound signs.

Those patients expecting surgery may be shocked by how the current system could encourage those who treat them to see pound signs rather than patients.

In 2007, not long after Twitter launched, an early adopter named Chris Messina came up with the idea of retrofitting pound signs into an ad-hoc system for sorting through the platform’s rising volume of tweets.

Now the plus sign may end up becoming shorthand for streaming itself, “in the same way the pound sign became the hashtag,” Ms. Doughty said.