I was thinking that there might be more to haki than we think. lately we have been exposed to more "haki" related people and places. in collection:
Definately:
1. When Shanks freaked out the sea king in luffy's hometown
2. When Silver knocked out the area full of people in human auction house
3. the woman of Amazone lily
4. Luffy posess some raw, increadable haki (according to Nyon)
5. When Shanks nocked out the bunch of people in WB's ship
posibilty
1. When luffy freaked out Duey's boar
Maybe
1. Mantra, power to hear "voices" in Skypia
2. How Gold Roger could "listen" to the pnoglyph (quoted from gingfan)
3. how zoro could "hear" the iron during fight with Mr.1 (quoted from gingfan)
Consistancy:
1. it seems that haki is mainly anout releasing one's spirit as a form of attack or magnifying them into object (like bow). IF i'm right about mantra and "listeneing" to phonoglyph as a type of haki, then it would mean that a form of listeneing could also be a form of haki.
2. haki ability user seems to be blood-related. and some people (like luffy) maybe born with it. Example is the women of Amazone Lily(who probaility are blood connected ot learned at early age). and if i'm right about Mantra being a form of Haki, Aisa was born with it (and number of Bilkans seems to have them more than others)
3. Anybody can learn Haki if you kow how to learn it (every1 at amazone lily uses it)
Can you think about some others that indicates a from of Haki?