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In page Asterisk:

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In fine mathematical typography, the Unicode character U+2217 ASTERISK OPERATOR (in HTML, ∗; not to be confused with U+204E LOW ASTERISK) is available. This character also appeared in the position of the regular asterisk in the PostScript symbol character set in the Symbol font included with Windows and Macintosh operating systems and with many printers.[citation needed] It should be used for a large asterisk that lines up with the other mathematical operators, sitting on the math centerline rather than on the text baseline.[1]