No other symbols, punctuation characters, or blank spaces are permitted.

However, not even all of the punctuation characters available in "figures" mode is used, most notably the addition sign remains unused.

No other symbols, punctuation characters, or white space are permitted.

The non-breaking space, which prevents having punctuation characters in isolation at the ends or beginnings of lines.

Characters have separate properties to denote they are a punctuation character.

This coding supported only upper-case unaccented letters, digits, and a few punctuation characters.

In most languages labels take the form of an identifier, often followed by a punctuation character (e.g., a colon).

This meant using no more than a single punctuation character or a pair of delimiting characters to express the few supported assertions.

Move punctuation character to the end of the previous line.

It uses many punctuation characters but no lower-case letters.