MT5 tries its damnedest to eliminate tags and entities from an entry title. Hoverer it does tolerate numeric character entnties. To include an < sign for example use: < — to include an > sign use: >.
Things that don't work as expected are:
- A plain < sign - it is stripped when partnered with a > sign. The HTML tag thus formed is removed.
- An entity like < - it is converted to &lt; as the user sees it.
An example can be found in this earlier blog entry.
