title: What's the difference between equ and db in NASM?
body: <pre><code>len:  equ  2
  len:  db   2
  </code></pre>
  
  <p>Are they the same, producing a label that can be used instead of <code>2</code>? If not, then what is the advantage or disadvantage of each declaration form? Can they be used interchangeably?</p>