Sigils, What are they?¿ Options

I've been reading a lot on sigils, and can't seem to think of what they are for / how they work in the right way.
Could someone help elaborate please?

http://www.angelfire.com/realm2/amethystbt...igilmagick.html
"Your unconscious mind, while extremely powerful, only understands symbols sent to it from your conscious mind. It does not understand what we would consider simple and straight forward communication. Hence, the need for sigils which are really just combinations of the letters in your statement of intent (minus repeated letters, state of being verbs: is, are, etc. and any vowels)"

Trouble with whats written is that the unconciouse mind would be in control of the body whilst the concious mind is of doing the dreaming / travelling etc if you can imagine that your etheric body is not concious where as your physical body whilst being awake is. Unless meaning the subconcious?

The sigil can be interpreted in the wrong way. If I saw a triangle then it could represent a pyramid in the subconcious mind and an I shape could represent one of those roman colum thingys. I have thought though if you can picture this that it would build a picture in your mind about the person attached to the incoming thought if your mind thought it were coming from a person, although it doesnt need to be a person. Can also interpret in your dreams.

The unconscious mind has way more power than the conscious mind. Your unconscious "spits up" things, and your conscious mind filters what is coming up. In my mind, the conscious mind doesn't have much control, it is the unconscious that spits up this stuff and then the will, which is unonscious directs its intent. A sigil is a symbol FROM the unconscious stating an intent.