How to make a symbol like this? Due to the reputation limit, I can't upload an image. So I decribe the symbol by word, I hope you can understand it. My symbol is:
a phi with an underscore. phi is
\niphi.
[Tex/LaTex] A symbol used in civil engineering
symbols
Related Solutions
For many symbols it’s just that the purpose is different. Consider the set minus: what you want there isn’t a backslash. You really want a “set minus” – which just happens to be displayed (sometimes) identically to a backslash. But it’s still fundamentally different.
Now, which of the two LaTeX codes is more readable:
\mathcal{F} \backslash \{ 0 \}
% or
\mathcal{F} \setminus \{ 0 \}
If the two are really identical (which I don’t believe since as Carsten points out there’s always the issue of spacing in math mode) one can simply be defined in terms of the other – e.g.:
\newcommand*\setminus{\backslash}
No harm in that. This still makes the usage more readable (see above) and the macro can be exchanged very quickly if you decide that the symbol should be displayed differently. For example, consider that the set minus is actually often written like a normal minus instead of like a backslash. If you have used the \backslash command, you now need to change all occurrences of that in your document.
If you have used a dedicated command then you only need to redefine that:
\newcommand*\setminus{\ensuremath{{}-{}}}
In practice, I redefine aliases for almost all macros that I use to fit my current use-case.
Following David Carlisle's suggestion here's a TikZ solution:
\documentclass{standalone}
\usepackage{tikz}
% w/o following space!
\newcommand{\quem}{\tikz[baseline=(wi.base)]{\node[fill=black,rotate=45,inner sep=.1ex, text height=1.8ex, text width=1.8ex] {};%
\node[ font=\color{white}] (wi) {?};}}
\begin{document}
Some \quem Text
\end{document}
You may alter the size of the black triangle by playing with inner sep and keep in mind that there is no space an the end of the macro.
Best Answer
Perhaps this does what you want. (Adapted from the Comprehensive Symbols Guide (available in your TeX Distribution.)
Update
A similar question has been asked on the site with some more general solutions: