Left double quotation mark
On Windows, hold Alt and type 0147 on the number pad, then let go of Alt.
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About the left double quotation mark
Quotation marks began in the margin. Fifteenth-century readers flagged important lines with marks beside them, and Francesco Filelfo’s 1483–84 edition of Aristotle marked quoted words with double dashes in the left margin. In the seventeenth century printers, especially in Britain, began setting the marks at the start and end of the quotation itself.