Byzantine question

[L'Impresario]

Phalanx is a very general term as I've already said. Depends on the context as well. Anna Comnena uses it about 60 times in "The Alexiad" and remember that it was written in the 12th century, so not that many "skutatoi" around.

BTW, when referring to a wedge, the classical term for a narrow front attacking formation is "keras" (κέρας), which literally means horn.