Symbolizing Proverbs

In his message 'Proverbs: Fear' Mark Driscoll gave some very practical advice for when we read Proverbs. One piece of advice that i thought was particularly good was to make a key of symbols & mark them in the column beside the verses that relate to it as you read through the book. This is a great way to find verses relating to various topics in the future.

I decided to begin this after the message was finished, beginning to read at ch1 vs1 & decided upon symbols as i hit topics.
For example:
♥ means something to do with the heart.
♂♀ means something to do with sex, lust, adultery etc.
£ means something to do with finances or work.
And so on & so on...

I thought i'd just pass this advice onward as i think it may be highly useful.