The traditional \Updownarrow is short. However, I want a "long" \Updownarrow. Does it exist? What package should I seek?

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The size of the \Updownarrow symbol can be increased (almost) arbitrarily by placing it inside a pair of \left...\right directives. Moreover, as @egreg points out in a comment, \big\Updownarrow through \Bigg\Updownarrown is available as well.

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    Also \big and so on. – egreg Sep 23 '17 at 17:57
  • @egreg - Thanks for this. I've amended my answer to include your observation. – Mico Sep 23 '17 at 17:59
  • Wow, cool! I originally thought that \big-family will not work before posting, since I guess those will enlarge the symbol "equal-ratio-ly" (leading a stick stem). – Eric Sep 23 '17 at 18:17

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