Editing Contact "Type" - Which field?

Hi All, On the 'Contact' page, their is the following listed under "Type" when editing the contact: - Admin - Finance - Operations - Sales - Support I cannot for the life of me find where this field is held - after looking through the contact fields, using inline customisation, I can match off every field apart from that one. Can anybody direct me as to where to customise this list, furthermore does it have any significance within Sage CRM? Thanks for your help, Adam Prettyjohns