Flaglore

Some little degree of flag-lore is valuable not only to the soldier, the seaman, or the traveller, but to everyone.

Source: wiktionary

The student of flags and flaglore, however, is aware that marine artists, with one or two notable exceptions, have in the past paid little attention to flag details, and does not, therefore, rely on them for accurate information.

Source: wiktionary

The new edition of this authoritative work has been thoroughly revised and brought up-to-date by H. Gresham Carr, who enjoys an international reputation for his knowledge of flags and flaglore.

Source: wiktionary

Differences in both design and shape are readily observed by everyone, but the specialistic terms to describe them are heard only among those whose interests and occupation bring them into more than casual contact with flaglore; however, nearly all the terms have been misapplied so often, and for so long, that they have become almost as general as the word flag itself.

Source: wiktionary