what’s the number symbol means?
i also get this. dunno what it means though
its your dps ranking, since there’s only you fighting it so you’re the only numbah one
the ranking of dmg you dealt with the monster in your case your the only one who killed it so youre 1
That is related to boss fights, only appear when you kill a boss-type monster.
As @jdlacanlale321 mentioned, it is a sort of dps ranking, in missions when you kill one of the bosses it appear on top of all players.
Its like in old RO, MVP rating on boss fights, but I hope they will not give extra rewards to MvP like they do in RO, as that would diminish chance to meet world boss even more
Even though on my archer I can go 12x MVP in 3 missions I always say MVP goes to Cleric/Swordie doing healing/buffing/tanking 
@deathmanelf to support cleric and tank swordie party member when mission ends:

