Valine
Valine is an amino acid with a large non-polar side chain -CH(CH3)2 [1], with the three letter code Val and the single letter code V. It is a hydrophobic amino acid.
The codons for valine are GUU, GUC, GUA and GUG [2].
References
Berg, J. M., Tymoczko, J. L., & Stryer, L. (2002). Biochemistry (5th ed.). New York: W.H. Freeman.