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How do you read this math symbol?

  1. Apr 6, 2012 #1
    Hi,

    I'm studying computation theory and this symbol that looks like a capital A without the middle bar is used to denote the empty string.

    What is it called?
    Thanks.

    EDIT: Looks like its a capital lambda?
     
  2. jcsd
  3. Apr 6, 2012 #2

    Hurkyl

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    Capital lambda ([itex]\Lambda[/itex]) sounds right. I have seen it used to denote the null string.
     
  4. Apr 6, 2012 #3
  5. Apr 6, 2012 #4
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