Re: Just to mudddy the waters a trifle ...
Your first paragraph nudged my curiosity about lb and it's origins:
http://mentalfloss.com/article/52058/why-are-%E2%80%9Cpound%E2%80%9D-and-%E2%80%9Counce%E2%80%9D-abbreviated-%E2%80%9Clb%E2%80%9D-and-%E2%80%9Coz%E2%80%9D