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.
Typeface and Font. Typeface. In typography, a typeface (also known as font family) is a set of characters that share common design features. A single typeface is represented by a specific weight, style, condensation, width, slant, italicization, ornamentation, and designer or foundry, but not by size. -http://en.wikipedia.org/wiki/Typeface.