Damage Numbers!
Also, I’ll clarify on the text ones:
Stun - Shows up when you stun an enemy, nothing groundbreaking.
Nuked - Shows up when you Instakill an enemy with an explosive weapon.
Bleed - Shows up when you inflict the Bleed status effect on an enemy, while bleeding enemies move slower and gradually take damage, unlike poison, Bleed can also stack up 4 times.
Bloodrot - Shows up when you inflict the Bloodrot status effect on an enemy, Bloodrot rapidly depletes enemy HP and spreads to nearby enemies, enemies inflicted with Bloodrot won’t drop any blood.
Poison - Shows up when you inflict the Poison status effect on an enemy, Poison exponentially drains enemy HP.