D smallest element in data hierarchy is FIELD.
REASON: It (field) is d smallest bit of information found in a record.
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Signal Element Versus Data Element: Let us distinguish between a data element and a signal element. In data communications, our goal is to send data elements. A data element is the smallest entity that can represent a piece of information: This is the bit. In digital data communications, a signal element carries data elements. A signal element is the shortest unit (time wise) of a digital signal. In other words, data elements are what we need to send; signal elements are what we can send. Data elements are being carried; signal elements are the carriers.
The smallest amount of an element is measured in terms of individual atoms. The smallest amount of an element can be one atom.
The smallest part of a database is a single data element, which is the most basic unit of information stored in a database. It can be a character, number, date, or other discrete piece of data.
ATOM
atom is the smallest part of element