Well, @amanda, I don't get symbols in my head, but when I am in the shower, I usually tend to do my budgeting. LOL
I can estimate how much money we'll have in retirement funds 10 years from now by adding our current monthly contributions, plus a minor amount for growth, and then include in all of this what year the mortgage will be paid off and when we can expect to be able to buy a new vehicle outright, and how much our Xmas budget will have in it each year.
All while shampooing my hair.
And if I figure all that out (I do this often, so it doesn't take me long anymore, lol) and still aren't through in the shower, I start estimating what I think other people's income/expenses might be and whether they can afford what I see them spending or whether they are going into debt to live that way.
I don't know why.. but I do math in the shower.