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The LaTeX command is \symbol. You can see that LaTeX default underscore does not use char 95 when encoding is OT1, because it occasionally fails depends on the font (i.e., the encoding does not guarantee that the character at position 5F (hex) is an underscore, that character in the specific font cmtt10 "happens" to be an underscore)
At any rate, math mode provides \sim, \backslash, and \setminus (the latter two appear to look the same and differ only by spacing in math mode). My LaTeX book – which, as you would expect, features the \ extensively – seems to use the verbatim environment. For example, this code: \begin{verbatim}
To say "Superscripts aren't really necessary." Sort of misses the point given that we're already writing in LaTeX and so presumably we care enough about the formatting that the author of the OQ (or anyone else who arrived at this page later) probably already thought through that it would be easier to just write "2nd", "3rd" &c. and decided that they wanted to go through the trouble of having ...
The document "Using Imported Graphics in LaTeX and pdfLaTeX" contains a section about float placement and how to use those options, it's 17.2 Figure Placement. It's available for download on CTAN in English and French. In short, the placement options means allowing placement at certain locations: t means top: Place it at the top of a page.
Textmode. You can always check detexify. Using \sim would appear to be the mathematically most correct way, since it produces TILDE OPERATOR (which is vertically positioned at operator level) as opposite to the Ascii TILDE (typically positioned higher).
Just put this code into your preamble. Then you can use := as usual, and you'll get horizontal symmetry. Much easier to use than \coloneqq, in my opinion. Per @Will Robertson's comment, there is also a feature of mathtools to change the vertical alignment of all colons in math mode. \mathtoolsset{centercolon}
Both {dingbat & \checkmark} and {bbding & \Checkmark} work when plugged into your MWE for me, so I'm thinking installation issues, or some subtlety of your system. – Chris H. Sep 11, 2013 at 14:53. Alternatively, you can use \ding{51} from pifont. See X mark to match checkmark. – Werner ♦.
The character printed by |, \mid, \lvert and \rvert is always the same, but with different math class: | is an ordinary symbol; \mid is a relation symbol; \lvert is an opening symbol; \rvert is a closing symbol. Access to the last two requires loading amsmath. Except \mid they can all be used in the context of delimiters.
The second hash fits your requirement (not dropping below the baseline), but personally I think the first is better positioned. Anyway, a nice hash symbol is a contradiction in terms. I agree. Compare p = \# d with p = \myhash d The depth of \# is the same that "p", and is as high as "d". In this way is too high.
I tried to write a sentence which includes the %-symbol using \text {}, but the function that the %-symbol has in LaTeX seems to block me from using it in a normal text sentence. Welcome to TeX.SX! You have to type \% (backslash percent) to get a percent sign. See also Escape character in LaTeX.