However, you might be thinking of:
* The female symbol: This is a circle with a cross below it, often used to represent women or the feminine. It's not specifically a "girl" symbol, but it's often used in that context.
* The Venus symbol: This is the same symbol as the female symbol and is also used to represent the planet Venus.
If you're looking for a specific symbol to represent a girl, you'll likely need to come up with your own, or find one that is widely used in a particular context.