[xheovqjd] Narrow punctuation

ASCII has 10 characters with narrow glyphs on proportional fonts.  Perhaps useful as a dense representation of digits.

. , ' : ; | I i l !

Here are a few from Unicode. There are likely many more.

¡ ‘ ’ ‚ ‛

Here are a few more ASCII characters that are sort of narrow.

1 ( ) [ ] { }