The ornamental design for a sensor, as shown and described.
FIG. 1 is a perspective rear/top/right view of a sensor according to one aspect of the present disclosure;
FIG. 2 is a back view of the sensor depicted in FIG. 1;
FIG. 3 is a front view of the sensor depicted in FIG. 1;
FIG. 4 is a right view of the sensor depicted in FIG. 1;
FIG. 5 is a left view of the sensor depicted in FIG. 1;
FIG. 6 is a top view of the sensor depicted in FIG. 1;
FIG. 7 is a bottom view of the sensor depicted in FIG. 1;
FIG. 8 is a perspective front/top/left view of the sensor depicted in FIG. 1;
FIG. 9 is a perspective rear/top/left view of the sensor depicted in FIG. 1; and,
FIG. 10 is a rear/top view of the sensor depicted in FIG. 1.
The broken-line showing of structural features is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.