The term 'CERTAIN RATING' can be broken down into three crossword solutions: Nielsen (7 letters), ONE (3 letters), and TEN (3 letters). Nielsen is a global measurement and data analytics company that provides market research, insights, and data about what people watch, listen to, and buy. ONE is a rating system used by Nielsen to measure television viewership in the United States. It measures the percentage of households that are tuned into a particular program. TEN is another rating system used by Nielsen to measure television viewership in the United States. It measures the percentage of households that are tuned into a particular program, but it is more specific than the ONE rating system, as it measures the percentage of households that are tuned into a particular program within a certain demographic.