On the devil's tail, there is a gesture that is an upright eight, or an upward pistol. What does this gesture mean?

I remember this seems to be an agreement between makarov and George W. Kousas. Makarov seems to have been very busy. La Kousas wanted him to stay with him when he was a child, but as the president, he was still busy with the celebration of the guild. So in order for Laxas Junior to see him, he raised his hand and stood upright, as if this were the case. Later, when La Kousas launched a civil war against the devil's tail, makarov made such a gesture because his grandfather was unwilling and worried about his exile. Everyone in the guild knew about it, so it later became an agreement or belief of the guild. You can watch the American Civil War in Wei Yao.