numeric
The native Japanese numeral for three, used for counting general objects with the counter つ.
りんごを三つください。
Please give me three apples.
三つ数えたら始めます。
I'll start after counting to three.
noun
three years old
Used specifically to refer to a child's age of three, often in the context of growth milestones.
娘は今年で三つになります。
My daughter will be three this year.