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A numeric indicator also sets grade 1 mode. Grade 1 mode, when set
by a numeric indicator, is terminated by a space, hyphen, dash or
grade 1 terminator.
While grade 1 mode is in effect, a grade 1 indicator is not required
unless a lowercase letter a-j follows a digit, full stop/period or
While grade 1 mode is in effect, contractions may not follow a
Grade 1 mode is terminated by a hyphen or dash, thus allowing
contractions to be used again. Therefore, a letter or letters that could
read as a contraction will need the grade 1 indicator.
When transcribing dates, time, coinage, ordinal numbers, postal codes or telephone numbers: follow print punctuation and order of symbols.
Refer to: Guidelines for Technical Material, Part 2, for more examples.
The spaced numeric indicator allows one or more spaces to intervene
between the numeric prefix and the root that would normally follow
immediately to form a digit or a decimal point or comma.
The numeric passage indicator sets numeric mode and grade 1 mode
for all text until the terminator is reached.
The numeric terminator follows immediately after the last affected
symbols-sequence, except as in 6.9.4 below.
Numeric indicators are not used in a numeric passage and any
lowercase letter a-j is preceded by a grade 1 indicator.
To preserve the general format of the enclosed text the numeric passage indicator may be placed by itself on a line above and the terminator on a line below the text.
Note: A numeric passage may be useful in cases such as a long worked example in mathematics, a series of arithmetic exercises, or a table with mostly numeric content.
Refer to: Guidelines for Technical Material, Part 4, for spatial
arithmetic examples illustrating the use of both the spaced numeric
indicator and the numeric passage indicator.