A fact known from direct observation.
A premise from which conclusions are drawn.
A floating reference point, or SLDMB, used to evaluate surface currents in a body of water. Often employed by coastal search and rescue.
A fixed reference point or set of reference points which precisely define a system of measurement or a coordinate system.
To provide missing data points by using a mathematical model to extrapolate values that are outside the range of a measuring device.
Discovery made; information.
Any symptom or occurrence in a disease, which serves to direct to suitable remedies.
That which serves to indicate or point out; mark; token; sign; symptom; evidence.
Act of pointing out or indicating.
An declared approximation of the price at which a traded security is likely to commence trading.