Beta (Β β) is the 2nd letter of the Greek alphabet and has a numeric value of 2. Beta should not be confused with a similar-looking but unrelated letter in German language orthography, ß.
In software development, a "beta version" of a product is one that is still in development but is published for testing purpose. See development stage.
... out of which 29.7% have children under the age of 18 living with them, 51.2% are married couples living together, 8.9% have a female householder with no husband present, ...