With perfectly square dimensions of 360mm x 360mm, the Couronne écriture format has a surface area of 129,600 sq mm or 0.1296 sq meters. Translating to "writing crown", Couronne écriture's name stems from early watermarks depicting angular regal motifs used to brand this specially sized parchment. The association highlights Couronne's prevalent use for letter writing, record keeping, accounting and administrative documents historically. Today it occupies nostalgic niche status for personal stationery, notebooks, diaries, poetry, captions, book plates, seals, cards, invitations, and anything requiring a stately symmetrical format. While international standards have largely superseded it, Couronne écriture retains a symbolic medieval character - reminding that communications and decrees were once painstakingly inscribed by quill on cuboidal sheets one at a time. So in a world of mass digital interactions, the dignified Couronne size persists as a token bridge to simpler eras when official proclamations bore individual attention and careful pencraft. Its heritage is kept alive by scribes and society stationers perpetuating the royal watermarked custom.