Handedness
Handedness was an individual's preference for using one hand over the other.

Geordi La Forge was right handed. () Beckett Mariner was left handed. () Ezri Dax was right handed before being joined with the  symbiont. ()

In 2365, Data, while playing Sherlock Holmes on the holodeck, asserted that a left footed person was also left handed. ()

One's handedness could be determined by an analysis of one's handwriting. In 2369, Data, as Holmes again, attempted to prove that a right handed murder victim's left handed brother wrote a suicide note by throwing a box of matches to the man. The accused caught it with his right hand due to a holodeck malfunction. Later, when assessing the handedness issue, Reginald Barclay asked  if he was right or left handed, to which Moriarty replied that he was left handed. () 

Some s had a dominant hand. In 2371, Benjamin Sisko asked Kasidy Yates if the Pike City Pioneers could use a right handed pitcher. () 

A boxer or fighter who was left hand dominant was called a southpaw. ()

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Physiology