Vexillology 

is the scientific study of the history, symbolism and usage of flags or, any interest in flags in general.  The word is a synthesis of the Latin word vexillum ("flag") and the Greek suffix -logia ("study.") The constitution of the International Federation of Vexillological Associations (known by its French acronym, FIAV) formally defines vexillology as "the creation and development of a body of knowledge about flags of all types, their forms and functions, and of scientific theories and principles based on that knowledge."

A person who studies flags is a vexillologist; vexillography is the art of designing flags; one who does so is a vexillographer; an admirer of flags is a vexillophile.

Sri Lanka, provinces 

Sri Lanka, provinces (Sinhalese: පළාත, Tamil: மாகாணம்) are the first level administrative division. They were first established by the British rulers of Ceylon in 1833. Over the next century most of the administrative functions were transferred to the districts, the second level administrative division. By the middle of the 20th century the provinces had become merely ceremonial. This changed in 1987 when, following several decades of increasing demand for a decentralisation, the 13th Amendment to the 1978 Constitution of Sri Lanka established provincial councils. Currently there are nine provinces.

Flags of the nine provinces

 Northern Province

North Central Province

North Western Province

 Central Province

Western Province

Sabaragamuwa Province

Southern Province

Uva Province

Eastern Province