The biggest number

I have given you all an index card. You have one minute to write down the biggest number that you can (barring infinity) using any mathematical function that you know (addition, subtraction, exponentation, ackermann, Knuth's up arrow, etc). Go.

>I suppose even totaling the number of elements of the single most thing of the universe would even be the largest number of possible relevance.

I meant to say:
>I suppose NOT even totaling the number of elements of the single most thing of the universe would be the largest number of possible relevance.

also, how i BB quote?