TV Guide Abbreviations

Hello my extraordinary Channel Community,
It might be an odd question, do we somewhere on the website have a list of the TV Guide Abbreviations i.e. what are the call letters to add a channel to the TV Guide lineup? Some channels for the life of me I just can't find when I am searching for (and I am talking about networks in the U.S. & Uk I am sure are on there), while switching to search all lineups.
Thank you for your kind guidance.

Are you trying to map guide data to channels you have?
What is the source, an HDHR tuner?

it's a Channels Tuner (on a blackberry) and those are channels I have added from a custom channels source (m3u8)

Not sure what that means

You have to find an appropriate callsign or gracenote stationid for the channel.
As far as I know, nobody has spent their time looking them all up for you. I'm sure if they have, they'll post or DM you.

Here's what I do when I need to get guide info for a channel that has none, or is incorrect.

You will need to invest some time using this method.