Notably, the inequality signs associated with his name are never found in his handwriting in the manuscripts but appear throughout as and . The significance of the inequality signs lies in the fact that this is the first time that such signs were used and accorded the same status as the equality sign. Less than or equal to, greater than or equal to. Cajori apparently does not show a use of the modern symbols with the single horizontal bar. Not equal to, not greater than, not less than.
Ball shows the symbol rather than .
Is nearly equal to.