A data logger is an electronic device that records data over time or in relation to location either with a built in instrument or sensor or via external instruments and sensors.
delimiter
A delimiter is a sequence of one or more characters used to specify the boundary between separate, independent regions in plain text or other data streams. An example of a delimiter is the comma character, which acts as a field delimiter in a sequence of comma-separated values.
time series
A time series is a sequence of data points, measured typically at successive points in time spaced at uniform time intervals or at irregular intervals (event based).
timestamp
A timestamp is a sequence of characters or encoded information identifying when a certain event occurred, usually giving date and time of day.
UTC
Coordinated Universal Time is the primary time standard by which the world regulates clocks and time. UTC is synonymous with GMT.