Left-handedness
Left-handedness is a  preference to use the left hand more than the right hand for daily activities such as writing or using tools. Most people can use either hand for many things. However, people very often have a definite preference for using the left or right hand for things such as: using a pen, using a knife, using scissors, brushing teeth, blowing their nose, and so on.  People who do not have a preference are called ambidextrous.