What does << do and mean in Ruby

I know this is a strangely simple question for you Ruby gurus but I have honestly googled and didn't find this in the documentation. I also didn't find a good explanation anywhere else. Please tell me what << means and why i'd use it. Thanks
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Binary Left Shift Operator.
The left operands value is moved left by the number of bits specified by the right operand.

a = 0011 1100
a << 2 will give 240 which is 1111 0000

The Google keyword is operators ;o)

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