Whilst similar to a monograms or a business logo, not all monograms or logos are sigils, though some might be.
Typically we create a sigil to "minify" a representation of a much larger or complicated idea, in this way it is somewhat akin to the meme's we see everywhere, a zip file of sorts that we can unpack in to greater meaning.
A common usage of a sigil is during a trance state, perhaps with an accompanying chant made up from the same letters. We stare at the sigil, understanding it's full meaning and allow it to imprint on our consciousness and from there - the universal.
Text is one method of creating a sigil, though not the only. Whilst there are other methods such as magic squares, a chaotic approach similar to that used by A.O. Spare is as follows:
- Write the word, intent or thing.
- Cross out double up's of letters (or not).
- Cross out vowels (or not).
- Arrange the letters in to a simple shape or pattern.
It is thought by some that shapes such as sigils can be imprinted on to our very genetics, which opens up a whole new level of 'unpacking' a sigil when we see it.
As a quick rundown this is not exhaustive, however when someone says "sigilization"; something akin to this process is what is being spoken on.


 
 