helek means A unit of time equal to an eighteenth of a minute (3⅓ seconds). Lexicurio rates it Sui generis — a strength score of 87 out of 100.
noun
- A unit of time equal to an eighteenth of a minute (3⅓ seconds)“For calendrical calculations, the day begins at 6 P.M., which is designated 0 hours. Hours are divided into 1080 halakim; thus one helek is 3 1/3 seconds.”