Lower right corner symbol – like _|

I just wonder what the code for the symbol _| is. (The symbol besides v in the picture below.)

Thanks a lot.

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I think it’s \lrcorner from amssymb

\documentclass[fleqn]{article}

\usepackage{amssymb}

\begin{document}
$\oint v_\lrcorner \dots$

\verb|\lrcorner| $\lrcorner$

\verb|\llcorner| $\llcorner$

\verb|\urcorner| $\urcorner$

\verb|\ulcorner| $\ulcorner$
\end{document}


I found it in the LaTeX symbol list, cf. How to look up a symbol?

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Yes!!!! Thank you so much! –  Vladimir Apr 7 '12 at 22:56
Heh... Just figured it out from the big list now. :( –  kan Apr 7 '12 at 22:57
@KannappanSampath: Sorry :-/ –  Tobi Apr 7 '12 at 23:00
No problem. I am new to writing answers to TeX.SX. I should learn from this answer: to write a minimal working code; and a bigger and nicer version of related symbols. +1. –  kan Apr 7 '12 at 23:01
@KannappanSampath That's why we insist on asking the users to pose the questions properly. It might sound snobbish at first sight but it makes sure that effort and time of our answerers don't get wasted. Please persuade more next time :-) –  percusse Apr 7 '12 at 23:07
The four AMS delimiters in the same order as they appear in the picture: \ulcorner;\urcorner;\llcornerand $\lrcorner$ :