What is the official nomenclature for this type of promo?

So you’re watching a sitcom or something on TV, and suddenly the station decides you need to be reminded that a different show will be coming on later. So they run a little silent commercial at the bottom of the screen, with the name of the show and a couple of cast members smiling and sometimes waving at you.

Is there an official name for that sort of thing?

A “pop-up” ad, or a “snipe.”

Makes Me Want To Destroy My TV Screen?

I’m up to #11!

I seem to remember when they started putting a small logo for the broadcasting station in the lower right corner of the screen that they were officially known as “bugs”. A friend used to complain about them as an unwarranted intrusion on his viewing. I’m afraid to think about what he would say about the current pop-ups which take up so much of the bottom of the screen. There have been times when they’ve actually covered up things relevant to the plot of the show.

Yup; the little network logo in the corner of the screen is known, in the industry, as a “bug.”

A union print shop will include the logo of the printer’s union somewhere on all their work. That’s the “union bug”. I don’t know whether that’s the origin of the term “bug” as applied to vid, but it’s been around since the heyday of the union movement after WW-I.

“Bugs” are the network logos in the bottom corner. What the OP is asking about is called a “lower third.”

And yes, they often collide with and obscure something you actually wanted to see.