Is it ensure, insure, or assure?
second letter of the Greek alphabet, c.1300, from Greek, from Hebrew/Phoenician beth (see alphabet); used to designate the second of many things. Beta radiation is from 1899 (Rutherford). Beta particle is attested from 1904.
beta be·ta (bā'tə, bē'-)
Symbol β The second letter of the Greek alphabet.
The second item in a series or system of classification.
A beta particle.
A beta ray.
Of or relating to the second position from a designated carbon atom in an organic molecule at which an atom or a radical may be substituted.
Of or relating to an isomeric variation of a chemical compound, such as a stereoisomer.
Mjolner Informatics ApS, Aarhus, implementations for Mac, Sun, HP, Apollo.
["Object-Oriented Programming in the BETA Programming Language", Ole Lehrmann et al, A-W June 1993, ISBN 0-201-62430-3].