Existing Letterforms
'TP Type' by Diane Zerr
'Modern Guilt' by Mario Hugo
'Ahoy there' by Ross Crawford and Dvid Soueh, The book of inspiration Vol. II
Here are a few letterforms of the letter 'O' found that have a unique design that could well influence the shape of the final ten letterforms communicating the word 'Extract'.
Along with inspiration from the letterforms that were found in magazines and books, also simple, well-known typefaces were founds to form the shape of the final ten letterforms. Fonts such as Gill sans, Arial black and Helvetica are amongst them. Above are examples of these. As they are very simple and bold they will hopefully deliver impact yet still be legible.
http://typophile.com/node/80006
In terms of finding a typeface that displays the idea of 'Extract', this font above gives the concept of erosion and a destroyed effect. Regarding the ten letterforms communicating the word 'Extract' something like this would reflect the idea well.
http://www.fonts101.com
Above shows letters made out of words which is a concept that could work similarly to the way of applying an 'Extract' within letterforms.