In a data flow diagram, a square represents a source or destination of data outside the system.
Definitions:
Denominator
The bottom number in a fraction, representing the total number of equal parts the whole is divided into.
Fraction
A mathematical expression representing the division of one quantity by another, indicating a part of a whole.
Acres
A unit of measurement for land, equivalent to 43,560 square feet.
Fenced
Enclosed or separated by a barrier, often for security or privacy purposes.
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