delimiter

[dih-lim-i-ter]
noun Computers.
a blank space, comma, or other character or symbol that indicates the beginning or end of a character string, word, or data item.

Origin:
1960–65; delimit + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

delimiter
1960, in computing, from delimit.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

delimiter definition

character
A character or string used to separate, or mark the start and end of, items of data in, e.g., a database, source code, or text file.
See also: record.
(2001-03-16)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
In this example, you are converting a tab delimited file, and thus will select
  a specific delimiter.
Do not place a record delimiter before the first record of a file.
If the primary business phone number is not sent, then a repeat delimiter must
  be sent in the first sequence.
Each record in the file must be followed by a record delimiter.
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