Question on channel labels on IPTV

So I am looking at an IPTV provider list, and for example on their list of US Music channels I notice some channels have a (F) or a (A) on them. Some other channels have (H) on them.

I am just curious if this is some kind of standard label to add on to channel names to signify something, or is this probably just something specific to this provider? Not finding any documentation thats obvious so I thought I would start here.