What letters represent the mother in a punet squar?

In a Punnett square, the letters that represent the mother are typically written along one side of the square, either the top or the left side. These letters denote the alleles that the mother can contribute to her offspring. For example, if the mother is homozygous dominant for a trait, the letters would both be the same (e.g., "AA"). If she is heterozygous, the letters would be different (e.g., "Aa").