I see it too - rotate image left 90 degrees and it looks like a leaping lamb.
That is how one of the jabbers explained it to me one year, back when I was still getting jabbed once per year. They just take the dominate strains from the previous flu season, then reintroduce them in 'dead' form so your body can react to them to build immunity without getting sick (hopefully).
The jab never made me sick, per se, but I will say in the 3 years now since I stopped taking it, I have been sick 0 (zero) times besides seasonal allergies.
I used to get URI's pretty regularly. I wonder how many times those were actually 'flu'? I do not think I have ever been diagnosed with the 'flu'. Maybe 1x.