We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
A date with an error, a laboratory code and a calibration marker.
Also known as: C14 date, Calibrated date notation
A radiocarbon date is written as a value with an error range, a laboratory code and either BP for an uncalibrated result or cal BC and AD for a calibrated one. Uncalibrated and calibrated dates can differ by centuries, so the marker is not a formality.
States a radiocarbon result as a value with an error range, prefixed by a laboratory code identifying who measured it.
Contexts: Technical drawing, Maps
Distinguishes uncalibrated results, written BP and counted from 1950, from calibrated ones written cal BC or cal AD, which can differ by centuries.
Contexts: Technical drawing, Maps
Gives an error range that is a standard deviation rather than a bound, so the true date lies outside the stated range about a third of the time.
Contexts: Technical drawing, Maps
A laboratory code, a hyphen, a number, a plus-minus sign and a second number, followed by letters.