What does the term 'O & 1' mean?

I've heard of this phrase,

O & 1 (Oh and one)
for awhile now during school.  What does it exactly mean?  Everyone seems to know except me.  Please help!

Friday, January 24, 2014

Todd Olivas

Todd Olivas is a court reporter and entrepreneur.
He founded TO&A in 2003.

  Comment by Kim M. | Wednesday, May 7, 2014
Does it refer to a score of some sort? As in, The Phillies are `0` (zero) and 1 so far in the series or She was 0 and 1 in the argument. Meaning, zero wins and one loss.
  Comment by Elaine | Tuesday, May 20, 2014
Original and one copy.

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