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In the Icelandic language, a strong noun is one that falls into one of four categories, depending on the endings of the characteristic cases, i.e. the nominative and genitive singular and the nominative plural. For masculines this gives the following four-way split to be counted as strong:
For feminines this looks like:
Most neuters are strong, and end in -s in the genitive singular with the exception of fé, genitive fjár. Although strong neuters technically only belong to one category, it is a diverse group, so about a dozen paradigms are necessary to account for varieties and exceptions.
The weak neuters are so few, that a list suffices, to be found on the page for weak nouns.
The strong-noun endings are -(a)í, -ta/-te, -the, -(e)acha, and (e)anna. Certain other nouns that take plain -a or -e may be strong if the nominative and genitive plural are the same. All nouns ending in vowels in Irish are considered strong.