Sunday is the 42nd day, which is six weeks of the counting of the Omer, the measure of barley that was harvested in ancient times at the beginning of the 49-day counting period and brought to the Holy Temple as a sacrifice. The end of the counting period coincides with the evening before Shavuot, the festival of the first fruits that also marks the handing down of the Torah on Har (Mount) Sinai. The blessing over the counting of the Omer is recited at night and is omitted during the day if one forgot to count.
This week is the seventh and last week of the counting and is the week of malchut (sovereignty, leadership), according to Rabbi Simon Jacobson. He has written, "There are seven basic emotions that make up the spectrum of human experience. At the root of all forms of enslavement, is a distortion of these emotions. Each of the seven weeks between Passover and Shavuot is dedicated to examining and refining one of them.
The seven emotional attributes are Chesed (loving-kindness), Gevura (justice and discipline), Tiferet (harmony and compassion), Netzach (endurance), Hod (humility), Yesod (bonding) and Malchut (sovereignty, leadership).