Here's how you can sign "deer":
1. Sign "animal": Make a "C" handshape and move it back and forth across your chest.
2. Sign "antlers": Make a "V" handshape with your index and middle fingers, and move them outwards like antlers. You can then make a "Y" handshape and move your fingers up and down as if the deer is moving its head.
You can also use other signs to describe a deer, such as its color, size, or what it is doing.
It's important to remember that sign language can vary between regions and individuals. The best way to learn how to sign "deer" is to find a local ASL teacher or interpreter.