What does the 'NEW' label that appears before the titles of some articles signify?

Whether you are using the 'Live' or 'Historical' data (see differences here), you might notice a 'NEW' label preceding the titles of some articles. This 'NEW' label indicates that the content has been identified for the first time within the selected timeframe. For instance, if you select a 6-hour timeframe in the Live pages section, content identified for the first time 7 hours ago will not be labeled as new. However, content spotted 3 hours ago will be labeled as new.