The ornamental design for a nasalpillow, as shown and described.
FIG. 1 is a top perspective view of a nasal pillow of our design;
FIG. 2 is a bottom perspective view of the nasal pillow of FIG. 1;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a left side perspective view thereof;
FIG. 8 is a rear side perspective view thereof;
FIG. 9 is a right side perspective view thereof; and,
FIG. 10 is a front perspective view thereof.
The dash-dot broken lines represent the bounds of the claimed design and dash-dash broken lines show portions of the drawings that form no part of the claimed design.