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Latex Micro

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I'm using TeXnicCenter for Windows (7) and I'm a bloody beginner in everything that concerns LaTeX. I'm using the siunitx package for mathematical formulas and it works just fine... with one exception. The \micro (e.g. \si{\micro} ) command doesn't work! It simply doesn't show the µ in the PDF file. I've tried to use \u as well without success. Does anybody know what the error could be?
I’ll throw this in here, as my search for a solution led me here, but my problem was another one.
Using XeTeX and Latin Modern, I found that the greek letter μ does not work.
However, the Unicode micro sign μ does work.
Knowing that, I added \sisetup{math-micro=\text{µ},text-micro=µ} , and now all seems well.
Here is a MWE which compiles fine, using the command @daleif suggested
As shown in the example, use \si for just units and capital \SI for a value-with-unit-combination.
And if you want a plain µ in the text, you could also try the command \textmu which is made available by the package \usepackage{textcomp}
Depending on which engine and encoding you use, you can just write a literal μ. Or you can typeset it in math mode as a variable $\mu$ . It depends on what use the μ has in your document.
If it is a quantifier then add the corresponding unit as daleif already pointed out in the comment.
Another solution is through the use of the "Babel" package + "Lualatex" as follows, this method defines the symbol as a greek letter:
This answer is in accordance with the solution proposed by David Purton:
Biblatex usage for multiple languages in same citation
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LaTeX symbols have either names (denoted by backslash) or special characters. They are organized into seven classes based on their role in a mathematical expression. This is not a comprehensive list. Refer to the external references at the end of this article for more information.

Letters are rendered in italic font; numbers are upright / roman. \ imath and \ jmath make "dotless" i and j, which are useful in conjunction with hats and accents .

Lower case Greek letters are rendered in italic font; upper case Greek letters are rendered in upright/Roman.

  \ Gamma
  \ Delta
  \ Lambda
  \ Phi
  \ Pi
  \ Psi
  \ Sigma
  \ Theta

  \ alpha
  \ beta
  \ gamma
  \ delta
  \ epsilon
  \ zeta
  \ eta
  \ theta

  \ iota
  \ kappa
  \ lambda
  \ mu
  \ nu
  \ xi
  \ pi
  \ rho

  \ sigma
  \ tau
  \ upsilon
  \ phi
  \ chi
  \ psi
  \ omega

  \ digamma
  \ varepsilon
  \ varkappa
  \ varphi
  \ varpi
  \ varrho
  \ varsigma
  \ vartheta

  \ aleph
  \ beth
  \ daleth
  \ gimel

  \ complement
  \ ell
  \ eth
  \ hbar

  \ hslash
  \ mho
  \ partial
  \ wp
The following characters don't have any spacing associated with them. That is, they are simple symbols, in class 0.

  \ #
  \ angle
  \ backprime
  \ bigstar
  \ blacklozenge
  \ blacksquare
  \ blacktriangle
  \ blacktriangledown
  \ bot

  \ clubsuit
  \ diagdown
  \ diagup
  \ diamondsuit
  \ emptyset
  \ exists
  \ flat
  \ forall
  \ heartsuit

  \ infty
  \ lozenge
  \ measuredangle
  \ nabla
  \ natural
  \ neg or \ lnot
  \ nexists
  \ prime
  \ S

  \ sharp
  \ spadesuit
  \ sphericalangle
  \ square
  \ surd
  \ top
  \ triangle
  \ triangledown
  \ varnothing
There is also a command \& which is not supported by Wikia's LaTeX parser.

Symbols that go above, below, or in the corners of other symbols.

Note 1: dotless i and j (symbols \imath and \jmath ) can be used to leave room for whatever hat you want them to wear.

Note 2: \sideset takes two required parameters, left side and right side, and must be followed by a sum class math operator that normally takes subscripts and superscripts below and above the symbol.

  \ overleftarrow{xxx}
  \ overrightarrow{xxx}
  \ overleftrightarrow{xxx}
  \ xleftarrow[under]{over}
  \ xrightarrow[under]{over}
The following commands are not supported by the Wikia's LaTeX parser:

Bold face: \ boldsymbol and \mathbf make bold face symbols, and \ pmb makes very bold face symbols. However, \mathbf cannot be applied to Greek symbols, for instance. The AMS "short guide" (see references) contains a cryptic comment, "generally speaking, it is ill-advised to apply \boldsymbol to more than one symbol at a time." Best not to discover why!

\boldsymbol{\pi} \mathbf{A}_{\boldsymbol{0} }

The \pmb command is not supported by the Wikia's LaTeX parser.

Simple symbols (class 0) are rendered without any space between them. Operators (class 1) are rendered with spaces. Spacing symbols change the amount of spacing, either by adding more space or taking spaces away. Space is measured in math units , or mu. 18mu equals 1em.

NOTE: commands \thinspace , \medspace , \thickspace , \negthinspace , \negmedspace , \negthickspace , \mspace , and \: are not impemented here at wikia.org!

Spaces of exactly the size of some rendered text can be obtained using the \ phantom , command, and its cousins, \ hphantom and \ vphantom . They are not implemented here at wikia.org!

These prefix operators accumulate the things they're prefixed to. "Extensible" means they have variable size to accommodate their operands, and their limits can appear below and above the operator.

  \ int
  \ oint
  \ bigcap
  \ bigcup

  \ bigodot
  \ bigoplus
  \ bigotimes
  \ bigsqcup
The \smallint command is not supported by the Wikia's LaTeX parser.

If your favorite operator, say, "foo", isn't listed, then you won't be able to use \foo(x) in your LaTeX equation. But don't fret. You can get the same result with \ operatorname {foo}(x). If your made-up operator needs displayed limits, as in \lim or \max , then use \operatorname*{foo} , as in the example in the following table.

  \ arccos
  \ arcsin
  \ arctan
  \ arg
  \ cos
  \ cosh
  \ cot
  \ coth
  \ csc
  \ deg

  \ det
  \ dim
  \ exp
  \ gcd
  \ hom
  \ inf
  \ injlim
  \ ker
  \ lg
  \ lim

  \ liminf
  \ limsup
  \ ln
  \ log
  \ max
  \ min
  \ Pr
  \ projlim
  \ sec
  \ sin

  \ sinh
  \ sup
  \ tan
  \ tanh
  \ varinjlim
  \ varprojlim
  \ varliminf
  \ varlimsup
  \ operatorname{foo}_0^1

The command \operatorname* is not supported by the wikia's LaTeX parser.

  *
  +
  -
  \ amalg
  \ ast
  \ barwedge
  \ bigcirc
  \ bigtriangledown
  \ bigtriangleup
  \ boxdot
  \ boxminus
  \ boxplus
  \ boxtimes
  \ bullet
  \ cap

  \ Cap or \ doublecap
  \ cdot
  \ centerdot
  \ circ
  \ circledast
  \ circledcirc
  \ circleddash
  \ cup
  \ Cup or \ doublecup
  \ curlyvee
  \ curlywedge
  \ dagger
  \ ddagger
  \ diamond
  \ div

  \ divideontimes
  \ dotplus
  \ doublebarwedge
  \ gtrdot
  \ intercal
  \ leftthreetimes
  \ lessdot
  \ ltimes
  \ mp
  \ odot
  \ ominus
  \ oplus
  \ oslash
  \ otimes
  \ pm

  \ rightthreetimes
  \ rtimes
  \ setminus
  \ smallsetminus
  \ sqcap
  \ sqcup
  \ star
  \ times
  \ triangleleft
  \ triangleright
  \ uplus
  \ vee or \ lor
  \ veebar
  \ wedge or \ land
  \ wr

  <
  =
  >
  \ approx
  \ approxeq
  \ asymp
  \ backsim
  \ backsimeq
  \ bumpeq
  \ Bumpeq
  \ circeq
  \ cong
  \ curlyeqprec
  \ curlyeqsucc
  \ doteq
  \ doteqdot or \ Doteq
  \ eqcirc
  \ eqsim
  \ eqslantgtr
  \ eqslantless
  \ equiv
  \ fallingdotseq
  \ geq or \ ge

  \ geqq
  \ geqslant
  \ gg
  \ ggg or \ gggtr
  \ gnapprox
  \ gneq
  \ gneqq
  \ gnsim
  \ gtrapprox
  \ gtreqless
  \ gtreqqless
  \ gtrless
  \ gtrsim
  \ gvertneqq
  \ leq or \ le
  \ leqq
  \ leqslant
  \ lessapprox
  \ lesseqgtr
  \ lesseqqgtr
  \ lessgtr
  \ lesssim
  \ ll

  \ lll or \ llless
  \ lnapprox
  \ lneq
  \ lneqq
  \ lnsim
  \ lvertneqq
  \ ncong
  \ neq or \ ne
  \ ngeq
  \ ngeqq
  \ ngeqslant
  \ ngtr
  \ nleq
  \ nleqq
  \ nleqslant
  \ nless
  \ nprec
  \ npreceq
  \ nsim
  \ nsucc
  \ nsucceq
  \ prec
  \ precapprox

  \ preccurlyeq
  \ preceq
  \ precnapprox
  \ precneqq
  \ precnsim
  \ precsim
  \ risingdotseq
  \ sim
  \ simeq
  \ succ
  \ succapprox
  \ succcurlyeq
  \ succeq
  \ succnapprox
  \ succneqq
  \ succnsim
  \ succsim
  \ thickapprox
  \ thicksim
  \ triangleq

  \ circlearrowleft
  \ circlearrowright
  \ curvearrowleft
  \ curvearrowright
  \ downdownarrows
  \ downharpoonleft
  \ downharpoonright
  \ hookleftarrow
  \ hookrightarrow
  \ leftarrow or \ gets
  \ Leftarrow
  \ leftarrowtail
  \ leftharpoondown
  \ leftharpoonup
  \ leftleftarrows
  \ leftrightarrow
  \ Leftrightarrow
  \ leftrightarrows
  \ leftrightharpoons
  \ leftrightsquigarrow
  \ Lleftarrow

  \ longleftarrow
  \ Longleftarrow
  \ longleftrightarrow
  \ Longleftrightarrow
  \ longmapsto
  \ longrightarrow
  \ Longrightarrow or
          \ implies
  \ looparrowleft
  \ looparrowright
  \ Lsh
  \ mapsto
  \ multimap
  \ nLeftarrow
  \ nLeftrightarrow
  \ nRightarrow
  \ nearrow
  \ nleftarrow
  \ nleftrightarrow
  \ nrightarrow
  \ nwarrow

  \ rightarrow or \ to
  \ Rightarrow
  \ rightarrowtail
  \ rightharpoondown
  \ rightharpoonup
  \ rightleftarrows
  \ rightleftharpoons
  \ rightrightarrows
  \ rightsquigarrow
  \ Rrightarrow
  \ Rsh
  \ searrow
  \ swarrow
  \ twoheadleftarrow
  \ twoheadrightarrow
  \ upharpoonleft
  \ upharpoonright or
     \ restriction
  \ upuparrows

  \ backepsilon
  \ because
  \ between
  \ blacktriangleleft
  \ blacktriangleright
  \ bowtie
  \ dashv
  \ frown
  \ in
  \ mid
  \ models
  \ ni or \ owns
  \ nmid
  \ notin
  \ nparallel
  \ nshortmid
  \ nshortparallel
  \ nsubseteq

  \ nsubseteqq
  \ nsupseteq
  \ nsupseteqq
  \ ntriangleleft
  \ ntrianglelefteq
  \ ntriangleright
  \ ntrianglerighteq
  \ nvdash
  \ nVdash
  \ nvDash
  \ nVDash
  \ parallel
  \ perp
  \ pitchfork
  \ propto
  \ shortmid
  \ shortparallel
  \ smallfrown

  \ smallsmile
  \ smile
  \ sqsubset
  \ sqsubseteq
  \ sqsupset
  \ sqsupseteq
  \ subset
  \ Subset
  \ subseteq
  \ subseteqq
  \ subsetneq
  \ subsetneqq
  \ supset
  \ Supset
  \ supseteq
  \ supseteqq
  \ supsetneq
  \ supsetneqq

  \ therefore
  \ trianglelefteq
  \ trianglerighteq
  \ varpropto
  \ varsubsetneq
  \ varsubsetneqq
  \ varsupsetneq
  \ varsupsetneqq
  \ vartriangle
  \
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