What is the meaning of [PATCH v3 0/3] things in mail subject

wuzhouhui <[email protected]> Mon, 22 Jan 2018 22:36:07 +0800
Newsgroups gmane.linux.newbie
Message-ID <20180122143607.GA33742@localhost>
In linux kernel mail list, I often see such string in mail subject:
    [PATCH V3 3/3]
or
    [PATCH 0/8]

What's meaning of "V3", "3/3" and "0/8"?

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