from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. One who studies flags.
Every vexillologist to whom we have shown our design recognized its Icelandic nature.
One vexillologist said "The green is luminous and not dark green; the red is almost pink and the blue looks purple" of the counterfeits.
 According to an eminent vexillologist, Professor Pierre Lux-Worm, the national flag of Tibet was based on an older 7th century snow lion standard of the Tibetan Emperor, Songtsen Gampo.
The term was coined by American vexillologist Whitney Smith.
Note that "David and Julia Line" require specific colors to tell the future with dice, (or they're a vexillologist Tajikstani-Madagascan couple).