Peripheral modifier

The term peripheral modifier is used by Huddleston & Pullum (2002) for focus particles in English, which always stand at the very periphery of the noun phrase.

Examples
even all the old books about Algeria that Maria bought, the bicycle alone

Reference
Huddleston, Rodney & Pullum, Geoffrey K. (eds.) 2002. The Cambridge grammar of the English language. Cambridge: Cambridge University Press.