From the PHB (3.5) pg 121 “An unarmed strike is always considered a light weapon.”
I don’t see what part of “always” is unclear though so it is always considered a light weapon.
PHB pg 139 “Striking for damage with punches, kicks and head butts is much like attacking with a melee weapon, except for the following:”
On the surface it looks like a contradiction, but when one reads the excepts spelled out on page 139 it is clear they are referring to being considered “armed”. Which is why they go into detail about “armed” unarmed attacks.
Coup de Grace (PHB pg 153) “As a full-round action, you can use a melee weapon to deliver a coup de grace to a helpless opponent.”
Melee Weapon (PHB pg 310) “A handheld weapon designed for close combat.”
Well since an unarmed strike is light weapon (see PHB pg 121) and if a character is holding one hand inside the other and then making a strike he meets the requirements since he is using a “melee weapon”.
The unarmed strike is a weapon designed for close combat (i.e., it can only be done with the creature’s natural reach), it is a light melee weapon and if a hand is within a hand it is by definition handheld.
Here are some side questions.
Is the soulknife's mind blade a melee weapon?
What happens when the graft weapons psionic ability is use?
What about the Whirling Blade spell? The weapon deals damage and is treated just as if you swung it in melee.
I don’t see what part of “always” is unclear though so it is always considered a light weapon.
PHB pg 139 “Striking for damage with punches, kicks and head butts is much like attacking with a melee weapon, except for the following:”
On the surface it looks like a contradiction, but when one reads the excepts spelled out on page 139 it is clear they are referring to being considered “armed”. Which is why they go into detail about “armed” unarmed attacks.
Coup de Grace (PHB pg 153) “As a full-round action, you can use a melee weapon to deliver a coup de grace to a helpless opponent.”
Melee Weapon (PHB pg 310) “A handheld weapon designed for close combat.”
Well since an unarmed strike is light weapon (see PHB pg 121) and if a character is holding one hand inside the other and then making a strike he meets the requirements since he is using a “melee weapon”.
The unarmed strike is a weapon designed for close combat (i.e., it can only be done with the creature’s natural reach), it is a light melee weapon and if a hand is within a hand it is by definition handheld.
Here are some side questions.
Is the soulknife's mind blade a melee weapon?
What happens when the graft weapons psionic ability is use?
What about the Whirling Blade spell? The weapon deals damage and is treated just as if you swung it in melee.