Hat symbol | definition of Hat symbol by Medical dictionary
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Beta Carotene and Retinol Efficacy Trial. A multicentre prevention trial of a large cohort of persons—18,300 men and women—at increased risk of developing lung cancer, who took beta carotene and vitamin A supplements
1. the symbol ^ above a number indicating the expected value or expected frequency.
2. used to indicate exponentiation in many computer languages, e.g. 100=10^2 or ten squared.