No, they do not.
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It is the result of drawing stem-and-leaf plots for two variables, back-to-back, such that they share the same stem.
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The ampersand causes two variables to share (point to) the same address in memory. For example: <php $first = "first"; $second = &$first; $second = "third"; echo "$first-$second"; // third-third ?> See the related link for an official, more detailed expanation.
The noun form of the verb to share is also share. There is also the gerund noun sharing.
Adjacent angles share a ray.