POD = Per One Damage.
In the table you can find that a Small Snake gives 40 pod, so for every point of damage you inflict, you are awarded 40 experience points. For example, if you would damage the snake for 15 damage, you would get 15 * 40 = 600 exp points.
NOTE: On multi-alt, healing an undead monster to harm it grants an extra 20 XP for each point of damage.
Per One Damage List
You can sort the information by pressing the icon next to the field name (i.e. "Monster" or "POD")
Monsters marked with an * only reward XP upon death. For a more extensive list on bosses that give a disproportionally large XP bonus on death, see the Boss XP Bonus topic.