Higgaion means – it is a musical sign, denoting probably a pause in the instrumental interlude. meditation
It is a word which occurs three times in the book of Psalms — (Psalms 9:16; 19:14; 92:3) (margin). The word has two meanings, one of a general character, implying thought; reflection , and another, in (Psalms 9:16) and Psal 92:3 Of a technical nature, the precise meaning of which cannot at this distance of time be determined.
In Psalm 9:16, is supposed to indicate a pause in the singing of the Psalm, for meditation, probably with an instrumental interlude.