A diagram that displays multivariate data. A good choice of glyph design can aid the recognition of complex similarities or distinctions in a set of data. A well-known example of an oilfield glyph is the Stiff diagram, which shows the patterns of cations and anions in fluids.

Reference:

Stiff HA Jr: 鈥淭he Interpretation of Chemical Water Analysis by Means of Patterns,鈥?Journal of Petroleum Technology 3, no. 10 (1951): 15-16.