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$C_4\times C_2 : C_2$: what does this mean?

I read a paper andam reading this paper where the object $C_4\times C_2 : C_2$ is used as a group structure in this paper. I know that $C_n$ is a cyclic group but don't know about ":"what kind of operation between two groups is identified by the symbol "$:$". Does anyone know about that? Thanks Thanks to everyone for the help.

$C_4\times C_2 : C_2$

I read a paper and $C_4\times C_2 : C_2$ is used as a group structure in this paper. I know $C_n$ is a cyclic group but don't know about ":" between two groups. Does anyone know about that? Thanks to everyone for the help.

$C_4\times C_2 : C_2$: what does this mean?

I am reading this paper where the object $C_4\times C_2 : C_2$ is used as a group structure. I know that $C_n$ is a cyclic group but don't know what kind of operation between groups is identified by the symbol "$:$". Does anyone know about that? Thanks to everyone for the help.

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$C_4\times C_2 : C_2$

I read a paper and $C_4\times C_2 : C_2$ is used as a group structure in this paper. I know $C_n$ is a cyclic group but don't know about ":" between two groups. Does anyone know about that? Thanks to everyone for the help.