A sensor, comprising: a first substrate comprising: a first side and an opposing second side, the first side having a recess; the recess defined by four side walls, defining a generally square shape, and a bottom wall, wherein the four side walls are substantially perpendicular to the bottom wall; a sensing diaphragm defined between the second side of the first substrate and the bottom wall of the recess; a boss extending from the bottom wall of the recess and into the recess, the boss defined by side walls, wherein the side walls of the boss are substantially perpendicular to the bottom wall of the recess; wherein the four side walls of the recess of the first substrate define the lateral extent of the recess of the first substrate, wherein the boss is patterned to comprise an "X" shape by extending continuously in two lateral directions across the entire lateral extent of the recess of the first substrate to one discrete location on each of the four side walls, and wherein a center of the "X" shape is at a center of the sensing diaphragm; only two piezoresistors, each piezoresistor being in or on the sensing diaphragm at a respective one of the discrete locations on neighbouring side walls; a second substrate comprising: a first side and an opposing second side; the first side having a recess; wherein the first side of the first substrate is secured to the first side of the second substrate such that the recess in the first substrate faces and is in fluid communication with the recess in the second substrate; wherein the sensing diaphragm is positioned above the boss. a first substrate comprising: a first side and an opposing second side, the first side having a recess; the recess defined by four side walls, defining a generally square shape, and a bottom wall, wherein the four side walls are substantially perpendicular to the bottom wall; a sensing diaphragm defined between the second side of the first substrate and the bottom wall of the recess; a boss extending from the bottom wall of the recess and into the recess, the boss defined by side walls, wherein the side walls of the boss are substantially perpendicular to the bottom wall of the recess; wherein the four side walls of the recess of the first substrate define the lateral extent of the recess of the first substrate, wherein the boss is patterned to comprise an "X" shape by extending continuously in two lateral directions across the entire lateral extent of the recess of the first substrate to one discrete location on each of the four side walls, and wherein a center of the "X" shape is at a center of the sensing diaphragm; only two piezoresistors, each piezoresistor being in or on the sensing diaphragm at a respective one of the discrete locations on neighbouring side walls; a first side and an opposing second side, the first side having a recess; the recess defined by four side walls, defining a generally square shape, and a bottom wall, wherein the four side walls are substantially perpendicular to the bottom wall; a sensing diaphragm defined between the second side of the first substrate and the bottom wall of the recess; a boss extending from the bottom wall of the recess and into the recess, the boss defined by side walls, wherein the side walls of the boss are substantially perpendicular to the bottom wall of the recess; wherein the four side walls of the recess of the first substrate define the lateral extent of the recess of the first substrate, wherein the boss is patterned to comprise an "X" shape by extending continuously in two lateral directions across the entire lateral extent of the recess of the first substrate to one discrete location on each of the four side walls, and wherein a center of the "X" shape is at a center of the sensing diaphragm; only two piezoresistors, each piezoresistor being in or on the sensing diaphragm at a respective one of the discrete locations on neighbouring side walls; a second substrate comprising: a first side and an opposing second side; the first side having a recess; wherein the first side of the first substrate is secured to the first side of the second substrate such that the recess in the first substrate faces and is in fluid communication with the recess in the second substrate; a first side and an opposing second side; the first side having a recess; wherein the first side of the first substrate is secured to the first side of the second substrate such that the recess in the first substrate faces and is in fluid communication with the recess in the second substrate; wherein the sensing diaphragm is positioned above the boss.