From Chapter 6, 'Capitals'

6.6   Accented Capitals

Accents should be retained on capitals in languages other than English, e.g.:

le Moyen Âge, Éire, el Éufrates, Ólafsson

However, the French preposition à may drop the accent when capitalized (A bientôt! ‘See you soon!’). Accents may also be omitted when using single letters as abbreviations, as in P. E. for Paul Éluard.

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