(telecommunications) an ISDN service delivered over T1, E1 or J1 datalines, with delivery of connections between 1472 kilobits per second and 1984 kilobits per second (kibibits)

A metric that estimates how well a television programme or advertisement reached its target audience

(astronomy) The number of meteors a single observer would see in one hour under a clear, dark sky (i.e. up to the limiting apparent magnitude of 6.5).

plural of Zenithal Hourly Rate

(demography) The difference between the crude birth rate and the crude death rate of a population

(demography) Number of deaths in a society per 1,000 people per year

(demography) Number of childbirths in a society per 1,000 people per year

(geography) The total number of deaths in a year among infants under one year of age for every 1,000 live births in a society.

An ISDN subscriber line that provides two B channels and 1 D channel.

Alternative form of flat tax