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How to look up a symbol?
Why can I only use some capital greek letters inside my equations?

I want to use the big rho (\Rho) in my document but can not find a package which provides that char. It is not in the default math package.

Is there a package with extended greek letters? Like here: http://en.wikibooks.org/wiki/LaTeX/Mathematics#List_of_Mathematical_Symbols

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marked as duplicate by clemens, Werner, ienissei, Kurt, Martin Schröder Dec 6 '12 at 22:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Big rho looks like a capital "P"… – Seamus Mar 27 '12 at 8:53
How about: \def\Rho{P} – Seamus Mar 27 '12 at 8:57
Welcome to TeX.SE. I took the liberty to format you post a little. See this link for more details on available formatting. We do not include "thanks" nor signature to our post, signature already appears in the bottom right corner and you can thank the others by upvoting and accepting their answers. – yo' Mar 27 '12 at 9:00
@percusse: That's a good idea. I'd suggest just mentioning the link in a comment then ("This question might be interesting to you if you're looking for a specific symbol ..."), unless it actually is a duplicate. – doncherry Mar 27 '12 at 9:29
Available greek capitals are \Gamma,\Lambda,\Sigma,\Psi,\Delta,\Xi,\Upsilon,\Omega,\Theta,\Pi,\Phi the rest is, as far as I know, the same with the Latin capitals. However for a more comprehensive look-up options for other specific symbols please see How to look up a symbol?. – percusse Mar 27 '12 at 9:34
up vote 13 down vote accepted

As @Seamus correctly points out, capital Rho has the same glyph as capital P. You can put \newcommand{\Rho}{\mathrm{P}} into your preamble to make the macro \Rho avialable. The usage of \mathrm is necessary if you use default math alphabets, because all greek capitals are typeset in up-right font.

List of those Greek letters whose capital variants coincide with latin capitals:

Α α alpha
Β β beta
Ε ε epsilon
Ζ ζ zeta
Η η eta
Ι ι iota
Κ κ kappa
Μ μ mu
Ν ν nu
Ο ο omicron
Ρ ρ rho
Τ τ tau
Υ υ upsilon
Χ χ chi

Plus remember that lowercase omicron looks exactly like o (and should be typeset by normal math font, i.e., without \mathrm).

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