How to add < to "allowed values list"? I'm trying to add:
1|small (&lt;100)
2|etc ...

but it will only display "small (" as the first option.
I've tried &lt; without success.
Any way to display the &lt; ?
Both &lt;, &amp;lt; and also &amp;#60; works with a checkbox/radio widget. &lt;select&gt; doesn't allow html code for options.

In consecuence Drupal strip tags if the &lt;select&gt; widget is configured. This is done in _options_prepare_options().

Short story: after some tests I've found that small (&lt; 100) works (there's a whitespace between &lt; and 100), so it is not considered a tag.

I've done my tests with:

drush php-eval 'print strip_tags("small (&lt; 100)") ."\n"'