Natal chart
The laid-out chart itself: four pillars of two characters each, plus everything derived from them.
In one sentence
The laid-out chart itself: four pillars of two characters each, plus everything derived from them.
How it is used
Everything a reading says has to point back to a character on the chart, which is why the first thing a careful reading does is show you yours and ask whether the birth data is right. Two people born minutes apart can hold different charts if a month boundary or an hour boundary falls between them. The chart is a record of a moment, not a measurement of a person.