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In the Wordpress editor (html mode) you'll need to become friends with < and > if you plan on showing any code (php, html... xml, most languages actually) that readers will want to understand.
I never thought about it, but assumed that the lt and gt stood for left, and gt, well, i couldn't quite place it, respectively. But alas, it dawned on me. Lt = less than while gt = greater than. Seems obvious now, but when you are thinking about angled brackets as markup, rather than as logic in an expression, the meaning that has value happens to be left vs. right.
Context is important.