To call a person with one hand, you can use gestures like waving or pointing to get their attention. If you're on a phone, you can hold it with one hand and use your thumb to navigate or dial. Alternatively, you can use a hands-free device or voice commands if available.
By their name
A slight of hand artist.
A person who is missing some fingers on one hand is often referred to as having a partial hand or hand loss condition. They may also be described as having a finger deficiency or digit amputation.
Ambidextrous.
ambidextrous
Stage hand
Tailor.
Ambidextrous
A person who is missing one hand is often referred to as an amputee or a one-handed individual.
A magician - or conjurer.
a palm reader
Magician/Illusionist