This read-only text field, held in the same row as oaEDFAAlarmRangeIndex, most likely carries a short vendor-supplied label naming the alarm parameter that row's thresholds apply to. An admin would read it to get a human-readable name for the row instead of having to memorize which numeric index corresponds to which physical measurement. For example, the returned string might read something like 'Output Power' or 'Pump Laser Bias' for that row (illustrative — the exact wording is vendor-defined and not spelled out in the source DESCRIPTION).