title: Why don't more/all of Unicode's right and left arrows match (in particular the "Black" arrows)?
body: <p>Unicode has a bunch of arrows, but many of them don't have matching right and left versions. In particular, the "Black" arrows, which seem the most obvious (to me) for use in navigation-related tasks, don't have a left and right version that generally "match:" ➡ doesn't usually look like ⬅. </p>
  
  <p>There is clearly discretion left up to fonts, here: for some fonts, they do match. But even the pages at FileFormat.info show the characters as looking different: compare <a href="http://www.fileformat.info/info/unicode/char/27a1/index.htm" rel="noreferrer">right arrow</a> against <a href="http://www.fileformat.info/info/unicode/char/2b05/index.htm" rel="noreferrer">left arrow</a>.</p>
  
  <p>Any idea what gives? It seems pretty obvious (to me) that you'd want matches (in all four cardinal directions, in fact) for any arrow included in Unicode. For this specific kind of arrow, the <a href="http://www.fileformat.info/info/unicode/char/2b06/index.htm" rel="noreferrer">up</a> and <a href="http://www.fileformat.info/info/unicode/char/2b07/index.htm" rel="noreferrer">down</a> arrows match. There are even matching arrows for the "corners."</p>
  
  <p>Note: I posted a related comment on this related question: <a href="https://stackoverflow.com/questions/4686518/cant-find-a-unicode-right-arrow">can&#39;t find a unicode right arrow</a></p>