|Easton's Bible Dictionary|
In Psalm 92:3 means the murmuring tone of the harp. In Psalm 9:16 it is a musical sign, denoting probably a pause in the instrumental interlude. In Psalm 19:14 the word is rendered "meditation;" and in Lamentations 3:62, "device" (R.V., "imagination").
Int. Standard Bible Encyclopedia
hi-ga'yon, hi-gi'-on (higgayon): The meaning of this word is uncertain. Two interpretations are possible; the one based on an allied Arabic root gives "a deep vibrating sound," the other derived from the Greek versions of Psalm 9:16, where we read higgayon Celah, takes it to mean an instrumental interlude.
Higgaion (2 Occurrences)
Psalms 9:16 The LORD is known by the judgment which he executeth: the wicked is snared in the work of his own hands. Higgaion. Selah. (KJV JPS ASV BBE DBY WBS NAS RSV NIV)
Psalms 92:3 Upon an instrument of ten strings and upon the lute; upon the Higgaion with the harp. (DBY YLT)