champion. Hebrew. 'ish-habbenayivl. "the man between the two [hosts]", or, the duellist. This accords with the subscription of Psalms 8 (see note there)
Muth-labben = the death of the man between; i.e. the death of the champion (Goliath) which Psalms 8 celebrates. Psalms 144, which has the same words, "What is man" has for its title in Septuagint. "A Psalm of David concerning Goliath"(compare1 Samuel 8:4; 1 Samuel 8:4 with Psalms 144:3). See 1 Samuel 17:23.
six. Note this number "6" stamped like. "hallmark" on this "man" (as on Nebuchadnezzar, Daniel 3) Compare the six pieces of armour, verses: 1 Samuel 17:5-7.
cubits. See App-51.
span. See App-51.