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HTML entities were described in the previous chapter.
Many mathematical, technical, and currency symbols, are not present on a normal keyboard.
To add such symbols to an HTML page, you can use the entity name or the entity number (a decimal or a hexadecimal reference) for the symbol.
<!DOCTYPE html>
<html>
<body>
<p>I will display €</p>
<p>I will display €</p>
<p>I will display €</p>
</body>
</html>