Sometimes, there is an absolute limit on the number of terms an officeholder can serve, while, in other cases, the restrictions are merely on the number of consecutive terms.
For example, Maxwell's Equations would always be capitalized, while quantum mechanics is usually un-capitalized. I searched half a dozen sites for an answer to this but found no clue about a rule. So go either way that makes you happy, but (most of all) be consistent.
The regretfully iconic jacket, referred to by Century 21 as Gold (and yes, the g in gold is capitalized in company literature), was the subject of a case study by public relations agency Burson-Marsteller, which was hired by Century 21 for a rebranding effort in 2008.