I wonder how far it's a standard defining/exclusing jargon model. I use jargon to convey my meaning to other people in the same business/social grouping more effectively; handily it also serves to exclude those who aren't in the same business/social grouping but might aspire to be without the qualifications I feel are required.

The 'grammar' has its own feel too (two horses, azure, on a field of or, gules - rahter than two blue horses on a gold background etc).