You can set the following attributes in the providers section
of your <membership defaultProvider...> element of web.config :
minRequiredPasswordLength
The default is 7
minRequiredNonalphanumericCharacters
The default is 1
So, the answer to your question is "minRequiredNonalphanumericCharacters", i.e.,
the number of minimum required Non-alphanumeric characters which users must provide.
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