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Sometimes an actual count is too difficult, for example, at a rally. Furthermore, an estimate meets the requirements.
In the Dutch version of Sesame Street the counts name was Graaf Tel aka Count Count.
A thin place is where the count of the yarn is half to the actual count of the yarn.
A thick place is where the count of the yarn is 50% greater than the actual yarn count. Means the total count at a thick place will be 150%.
A nep is a small entanglement of fibers which has a size double to the actual count of the yarn.
Actual/360 is the day-count convention used for T-bills.
Actual/360 is the day-count convention used for commercial paper.