The constellation's of Orion and Canis Major both use the same sign for the phonetic.
These constellations were held as auspicious. The constellation Orion below is actually
just to the right of Canis Major. The dictionary below has Ishv-agra thus Agrahayani is
the name of the Nakshatra Mrigasiras that is a close match for the sign of a field below
the square with four lines going through it (top and bottom seal on the left).The Vedic
peoples used the stars in their dating system and this date became famous
Ish-us-tri-kanda the threefold arrow (Orion).