ideograph / idiograph [ˈɪdiəgræf]
ideograph – n. = ideogram, a character symbolizing the idea of a thing without indicating the sequence of sounds in its name (e.g. a numeral and many Chinese characters)
idiograph – n. – a mark or signature peculiar to an individual
Example: Even the typical empirical study involving a sample of subjects from a seemingly well-specified population is, in a strong sense, an