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Given a vector $v=<1,2,3>$ I want to have a new vector $v'$, which is the vector $v$, appends with a number $4$. How should I represent $v'$ mathematically?

What I wish to have is something like $v'=v^4=<1,2,3,4>$, where ^ is an appending symbol for vector (therefore my main question is, does it exist such "vector appending" symbol in maths?)

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    What do you mean by appending? What is "type alphabet"?2012-11-15
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    This question has also been asked at tex.SE: http://tex.stackexchange.com/questions/83972012-11-15
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    We rarely append vectors. We do append other things (like words, although we use the fancier verb «to yuxtapose») and then we use no sign, just like multiplication.2015-02-01

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