I believe it means the same as redline. It would seem the older generation referred to the comparing of two documents, one being the original and the second, the revised, as "Redlining". The younger generation refers to it as "Blacklining".
Blackline GPS was created in 2004.
A blackline tilefish is a species of tilefish, Latin name Caulolatilus cyanops.
A blackline is a document indicating the differences between two versions of another document.
A blackline version of a document is the final version after all revisions have been accepted.
Blackline The Beirut Contract - 2014 was released on: USA: 2014
What does a 3 at end of email mean
Subject Is What The Email Is About.
email corriente
Its mean its for password and email so you can login.
It means constantly check email
it means use a backup email
an extra email for the website to log in