how did the em dash get its name
Dash The dash is a punctuation mark that is similar in appearance to a hyphen or minus sign, but differs from both of these symbols primarily in length and function. The most common versions of the dash are the en dash (–) and the longer em dash (—), whose names historically were loosely related with the length of a lower-case n and upper-case M, respectively, in commonly used typefaces.
Santa Claus's reindeer When, what to my wondering eyes should appear, but a miniature sleigh, and eight tiny rein-deer, with a little old driver, so lively and quick, I knew in a moment it must be St. Nick. More rapid than eagles his coursers they came, And he whistled, and shouted, and call'd them by name: "Now, Dasher! Now, Dancer! Now, Prancer, and Vixen! "On, Comet! On, Cupid! On, Dunder and Blixem! "To the top of the porch! to the top of the wall! "Now dash away! dash away! dash away all!"