Quote from acrary:
We used to use gambling chip colors when talking about order sizes to our guys on the floor. Orange chip = $1,000, so when I talked to a floor trader about upcoming orders we'd talk like "Tell Jimmy to hit the can now, I'm gonna need a orange of SPU's in about 10 min." (meaning I'll need to buy 1,000 September SP contracts coming up, so Jimmy better go take a quick bathroom break). We used chip colors to avoid errors because of the floor noise level.
Doesn't seem too relevant to your context, though.