# How do you read this math symbol?

1. Apr 6, 2012

### zeion

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. Apr 6, 2012

### Hurkyl

Staff Emeritus
Capital lambda ($\Lambda$) sounds right. I have seen it used to denote the null string.

3. Apr 6, 2012

4. Apr 6, 2012