A NOR gate can have two or more inputs. The o on the output means not showing that it is a Not OR gate. The output of a NOR gate is true when none of its inputs are true.
Logic gates process signals which represent true (1, high, +Vs, on) or false (0, low, 0V, off). For more information please see the page on logic gates. There are two sets of symbols: traditional and IEC (International Electrotechnical Commission).
An OR gate can have two or more inputs. The output of an OR gate is true when at least one of its inputs is true.
An AND gate can have two or more inputs. The output of an AND gate is true when all its inputs are true.
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