Presumably Liz is short for Elizabeth. Although either way, the lead character on 30 Rock often goes by simply "Lemon."
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<a href="http://www.tvfanatic.com/gallery/elizabeth-lemon/"><img alt="Elizabeth-lemon" src="http://images.tvfanatic.com/iu/t_full/v1371129354/elizabeth-lemon.png" /></a>
- Photo Credit:
30 Rock Season 3 Episode 21: "Mamma Mia"
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- 30 Rock Photos, Liz Lemon Photos
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- Steve Marsi