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+===== Variables =====
+[[Expression]]s by themselves aren't particularly powerful. [[Function]]s like previous(), either() and visited() can help in making [[link]]s, [[<<print>>]] and [[<<if>>]] macros more interesting, but if you want anything more complex than those, **variables** will be necessary.
+A variable is a place to store a value so that you can remember it later. You can store strings, booleans and numbers in variables. The variable ''$name'' might contain the main character's name, "Agatha Christie", or the variable ''$money'' might contain the amount of money Agatha has in her pocket -- the number 15.75.
+==== Variable names ====
+Variables have a few restrictions on their names. They must start with a $ sign. That's called a sigil — it tells the computer that what's coming next is a variable, not a number or string.
+After the initial $ sign, a variable name can begin with a letter, either uppercase or lowercase, or an underscore _. After the first letter, you can have any combination of letters, numbers, or underscores. Punctuation and spaces aren't allowed anywhere.
+Here are some legitimate variable names:
+<code>
+$housesDestroyed
+$_my_favorite_color
+$AN_EXTREMELY_IMPORTANT_NUMBER
+$street8
+$i
+</code>
+Some bad variable names:
+<code>
+$what was it called
+$Idon'tRemember
+$3.95
+$8thSurprise
+$$$make_money_fast$$$
+</code>
+To manipulate variables, see the articles for the [[<<set>>]] macro and the [[<<remember>>]] macro, as well as the [[link]] syntax.

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