What are all the fonts or font styles I can use in math mode, and which packages are required in order to use them? Let's assume I'm using standard Computer Modern or Latin Modern (lmodern) fonts. Edit: It'd be great to see examples of what the different styles look like, probably via images. sets the current font size to 5cm with centimeter leading. If you are using the latex or pdflatex engines, you may get a warning similar to the following: LaTeX Font Warning: Font shape `OT1/cmr/m/n' in size not available (Font) size substituted on input line Fonts and TeX. In principle, TeX can use any font for which it has metrics (character widths, kerning, etc.), and shapes (these days, generally PostScript Type 1 or TrueType or OpenType). A couple notable articles on basic font concepts and usage in LaTeX: Essential NFSS, by Sebastian Rahtz. Font selection in LaTeX, by Walter Schmidt.