It seems \v is like \emph or \textbf to represent the letter or number in other forms. But what does it stand for? Is there some other not common character transformation in LaTeX?

  • Welcome to TeX SX! It is the letter x with a caron above. – Bernard Sep 30 '19 at 0:55
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    \v is a text-mode command; it places a "v-check" or "caron" symbol above its argument (generally a single letter). \v should never be employed in math mode. Instead of $\v{x}$, one should write $\check{x}. – Mico Sep 30 '19 at 2:09
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    What does \V{x} look like? Can you provide an image? – Werner Sep 30 '19 at 6:00
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    \V is not defined in standard LaTeX. Please tell us what classes and packages you are using. See also tex.stackexchange.com/q/36955/15925 for general techniques. – Andrew Swann Sep 30 '19 at 6:02
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    Where did you find this TeX code? Since you don’t know what it means, I presume it’s an extract you’re taking from somewhere else. Since \V isn’t a standard LaTeX command, it must be defined in the specific document you found it in (look for a like beginning \newcommand[1]{V} or similar), or one of the packages the document loads. Without seeing the rest of the documents or knowing which packages it loads, we can’t help you. – Peter LeFanu Lumsdaine Sep 30 '19 at 7:39

Table 18. I believe this is what you are asking? Though it's not really $\LaTeX$ related.

enter image description here

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