For unusual characters or symbols that you cannot type directly (either because they aren’t available on your keyboard or because you don’t know which key combination produces them), you may find the “Insert custom character” button useful: visual post or page editor, second row of edit buttons, omega icon (if you only see one row, click rightmost button). Clicking this button opens up a palette with numerous characters such as letters with accents and other marks, some mathematical symbols including Greek letters, etc. (see Support doc).
Alternatively, or for additional symbols, you can paste code snippets called html entities (see my previous post for a few examples). Those must be pasted in the html post or page editor; they also work in text widgets as well as in title boxes. You can find lists of symbols and corresponding html entities in various webpages, for instance here or here. For an apparently exhaustive list, see “Html entity index” under Links 1 in my sidebar.
In the html editor and in text widgets (but not in title boxes) you can also change the color and/or the size of the symbols by enclosing the html entities in appropriate tags, as shown in this post. For example:
And that should be all. Unfortunately, many users use Explorer… In Explorer, many of those symbols won’t render correctly, or won’t render at all, if you only paste the html entity for them; you need to specify the special font that will make the creature understand:
<span style=”font-family:Arial Unicode MS;”>HTML ENTITY HERE</span>
If you can check things in Explorer, paste the entity alone, examine the result, add the font-family command if needed. If you can’t check, better err on the safe side and add it anyway.
(And if you’re using Explorer as your main browser, better download and start using a decent one, namely Firefox or Safari.)
Related post: Calling Attention to Yourself, by fellow forum volunteer Tess.