Which pedigree symbol is used to represent a female carrier of a recessive x-linked trait?

The pedigree symbol used to represent a female carrier of a recessive X-linked trait is a half-filled circle. In the pedigree charts, a circle is used to present females while a square is used to present males. If a female has a trait, the circle is filled in. If a female is a carrier of a recessive X-linked trait, the circle is half-filled.

Since a female is both xx chromosome and the male passes down the x chromosome, than the offspring would be female since a female is xx.