A car's ignition switch serves several purposes. First, it allows you to control the power to many of the car's accessories, preventing accessories from running down the car's battery when the car is parked for a long period of time.
Cardinality is the term used in database relations to denote the occurrences of data on either side of the relation. In the common data architecture, cardinality is documented with data integrity but not with data structure. There are several types of cardinality defining relationships between occurrences of entities on two sides of the line of relationships.
Parity may refer to: 1  Parity (computing) Parity bit in computing, sets the parity of transmitted data for the purpose of error detection. 2  Parity (mathematics), indicates whether a number is even or odd Parity of a permutation, indicates whether a permutation has an even or odd number of inversions. Parity function, a Boolean function whose value is 1 if the input vector has an odd number of ones.