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Linux man page why to use number ?

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Last Modified: 2012-05-11
Hi, I happen to use the man command in the following way
# man 3 pthread_init.

How can i find out pthread_init man page can be retrieved only mentioning by number 3 ?.. I end up tring from 1 to 3 .


What does this number means ?? Can someone provide be bit explanation about it ?.  
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