There are many more examples. Note that measuring each of these properties will not alter the basic nature of the substance. Examples of chemical properties are: heat of combustion, reactivity with water, PH, and electromotive force.
Mathematical fonts. In mathematical mode you can change the typefaces of the fonts when needed. For instance, it's customary to represent real numbers with a blackboard bold font, or topological spaces with calligraphic font. This article shows several fonts in math mode.
Microsoft also has a font called Symbol, and it too is widely available, coming bundled with MS-Windows operating systems. It is a TrueType font, in files named symbol.ttf and symbol.fot in the windows\system directory under Windows 3.1. Alas, this has a different character set than the Adobe font of the same name, with many moved or missing mathematical symbols, although like its namesake it does contain the entire Greek alphabet.