and I just realized upon reading this that it’s a person praying because who high fives to the opposite hand of the person they are high fiving. Sure it happens occasionally like when your standing side by side of something, but also the thumbs in the emoji are not fully extended like the rest of the fingers like they would be in the scenario of a high five. If this were a high five, both of the peoples thumbnails would be poking each other and it would provide for a painful high five.
really though the reason that this is not a high five (at least in my eyes) is because the sleeve colors are the same, suggesting one person. The only other emoji with two people wearing the same color is of the people in costume dancing, but all the other emoji’s with 2+ people have each person wearing a different color as to avoid what little confusion that might ever cause.