Nomenclature
The nomenclature for SNPs can be confusing: several variations can exist for an individual SNP and consensus has not yet been achieved. One approach is to write SNPs with a prefix, period and "greater than" sign showing the wild-type and altered nucleotide or amino acid; for example, c.76A>T. SNPs are frequently referred to by their dbSNP rs number, as in the examples above.
Read more about this topic: Single Nucleotide Polymorphism