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In page Ampersand:

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The plus sign + (itself based on an et-ligature[2]) is often informally used in place of an ampersand, sometimes with an added loop and resembling ɬ.[citation needed] Other times it is a single stroke with a diagonal line connecting the bottom to the left side. This was a version of shorthand for ampersand, and the stroke economy of this version provided ease of writing for workers while also assuring the character was distinct from other numeric or alphabetic symbols.