The × symbol for multiplication was introduced by William Oughtred in 1631.
Oughtred also introduced the abbreviations sin and cos for sine and cosine functions.
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Robert Recorde, who designed the equals sign, introduced plus and minus in 1557. Brahmagupta was an Indian mathematician who invented the multiplication sign around the 19th century. Johann Rahn first used the division sign in his book Teutshe algebra in 1659.
The multiplication sign on my keybord is * or ctrl 8
x
http://en.wikipedia.org/wiki/Multiplication_sign It's just called the "multiplication sign" or "multiplication operator".
= is the equals sign + is the plus sign * is the multiplication sign / is the divide sign - is the minus sign