C.R.S. § 39-11.5-116: Abbreviations, letters, and figures may be used.

In all advisements for the public auction and in entries required to be made by the assessor, county clerk and recorder, treasurer, or other county officers in lists, books, rolls, certificates, receipts, deeds, or notices, the assessor, county clerk and recorder, treasurer, or other county officer may use letters, figures, and abbreviations to denote townships, ranges, sections, parts of sections, lots, blocks, dates and amounts of taxes, delinquent interest, and costs.