The shell bone script for character Auspicious is
The explanation of Dictionary of Pictography (《象形字典》) is that the top is an elongated pointed tablet of jade held in the hands by ancient rulers on ceremonial occasions.
The bottom is Mouth.
The character means that King or The most powerful Person holds the tablet of jade to say something in praying for good weather or lucky for public.
The bronze script for the character is
The top is like an ax, weapon for war. Some people believe that the bottom is a bag for the ax, people got a good auspicious sign for a battle, it is time to take the weapon to fight.
The big seal script for the character is
There is dispute on what the top is? tablet of jade or ax?
The small seal script for the character is
Similar to big seal script.
The clerical script for the character is
As you see above. the explanation of the character from the Dictionary of Pictography is that To pray for auspiciousness, but some disputes, the major is that the ax is out of the bag because auspicious sign showed up.
We will see more characters which have disputes on their meanings.
The pinyin for 吉 is Ji2.