Referring a long phrase

single-word-requests

Solution 1:

Revised answer after comments from OP

According to the Wikipedia page on Basmala, Bismillah is an incipit. According to ODO, the definition of incipit is:

"The opening of a manuscript, early printed book, or chanted liturgical text."3

First answer

Colloquialism. According to ODO:

"A word or phrase that is not formal or literary and is used in ordinary or familiar conversation."1

Attribution

1 "Colloquialism | Definition of Colloquialism in English by Oxford Dictionaries." Oxford Dictionaries | English. Accessed March 22, 2018. https://en.oxforddictionaries.com/definition/colloquialism.

3 "Incipit | Definition of Incipit in English by Oxford Dictionaries." Oxford Dictionaries | English. Accessed March 22, 2018. https://en.oxforddictionaries.com/definition/incipit.

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