اِسْم إِنَّ
ism inna
Subject of inna & sisters
Nahw · syntaxSyntactic rolecore term24+ in the Qur'an
Also written: Inna wa Akhawatuha · Inna · Huruf Mushabbahah
In one line
The noun of inna and her sisters — put into nasb by the particle.
Classical definition
إِنَّ وَأَخَوَاتُهَا تَنْصِبُ الاسْمَ وَتَرْفَعُ الخَبَرَ.
(الآجرّومية)
What it is

إِنَّ (“indeed”) and her sisters enter a nominal sentence and rearrange it: the noun that follows إِنَّ — its ism — is pushed into the nasb state, while the predicate stays in rafa'. So مُحَمَّدٌ رَسُولٌ becomes إِنَّ مُحَمَّدًا رَسُولٌ — the same statement, now with added emphasis and a changed ending on the first noun.

How to spot it
Recognition test
Right after إنّ / أنّ / لكنّ …, the first noun, in nasb, is the ism inna.
In the Qur'an
إِنَّ ٱللَّهَ غَفُورٌ رَّحِيمٌ
Al-Baqarah 2:173 — “Indeed Allah is Forgiving, Merciful”
ٱللَّهَ is the ism of إنّ, in nasb (fatha); غَفُورٌ is its khabar, in raf'.
Related terms
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From the free course The Language of Quran — Easier than English (Book 1) (LoQ1), taught by Ustad Muhammad Arjan Ali.

Domain: Nahw · Category: Syntactic role · Frequency in the Qur'an: 24 · Source: الآجرّومية, cross-checked against the Quranic corpus · Reviewed by Ustad M. Arjan Ali