Mortar Cements

Type N Cement
For Exterior, Above-Grade Walls.
Type N is a medium compressive-strength cement. Type N is recommended for most exterior, above-grade walls exposed to severe weather, including chimneys.

Type S Cement
High Strength Non-Shrink Grout.
Type S is sometimes specified for masonry at or below grade, but offers another quality. S has high compressive strength, but adds high tensile bond strength.

These are blended cements with no sand component.