Generally, use a groupsign which bridges a diphthong and an adjoining letter unless the diphthong is printed as a ligature.

Use the lower groupsign for "ea", "bb", "cc", "ff" or "gg" at the end of a word when a suffix is added to the word or when it is the first word in an unhyphenated compound word.

The following symbols may occur in numeric mode:

• the ten digits;
• full stop (period);
• comma;
• the ten numeric space-digit symbols;
• simple numeric fraction line; and
• the two line continuation indicators.

Refer to: Section 11.3, Technical Material, for the definition of a simple fraction and the use of general fraction indicators.

A space or any symbol not listed in 6.2.1 terminates numeric mode.

Generally, use a groupsign which bridges a word and its suffix unless its use would hinder the recognition or pronunciation of the word.

When a full stop (period) is followed by a number, it precedes the numeric prefix # unless it is clear that it is a decimal point.

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 comma.

While grade 1 mode is in effect, contractions may not follow a number.

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.