sparkline
n.— «These little data lines, because of their active quality over time are called sparklines: small, high-resolution graphics embedded in a context of words, numbers, images. Sparklines are data-intense, design-simple, word-sized graphics.» —“Sparklines: Intense, Simple, Word-Sized Graphics” by Edward Tufte Beautiful Evidence May 27, 2004. (source: Double-Tongued Dictionary)