7 Adar is the yartzeit of Moshe Rabbeinu. The following is a small excerpt from Likutei Mohoran 215:
The gematria of שמד is 344.
The gematria of משה is 345.
The gematria of רצון is 346.
משה stands between שמד and רצון because he continually tried to sweeten שמד and turn it into רצון during his lifetime and continues to do so after his passing. He sweetens the "nations" and makes "geirim". (See inside for the full text)