Noun
datum line (plural datum lines)
(engineering) A line which serves as a reference or base for the measurement of other quantities.
In Parliament last week, Norton MP Temba Mliswa bluntly said if the Zanu PF government wants MPs to join their cause, then they must first sort out the welfare issues of MPs who are earning $18 000 which is far below the poverty datum line of $20 000. Source: Internet
“The food poverty datum line represents the minimum consumption expenditure necessary to ensure that each household member can (if all expenditures were devoted to food) consume a minimum food basket representing 2 100 calories. Source: Internet