A specialized form of informal English used by tradesmen among themselves is?

The specialized form of informal English used by tradesmen among themselves is often called "shop talk" or "trade jargon".

Here's why:

* Shop Talk: This refers to the specific language used by people in a particular profession, especially when they are talking about their work. It often includes technical terms, slang, and abbreviations specific to the trade.

* Trade Jargon: This term emphasizes the specialized vocabulary and expressions used by people in a particular trade.

Some examples of trade jargon used by tradesmen include:

* Construction: "bang a nail," "run a bead," "rough in," "framing"

* Plumbing: "sweat a pipe," "run a trap," "stub out," "rough-in"

* Electrical: "pull wire," "run conduit," "hot" (referring to live wires), "ground"

It's important to note that trade jargon can vary widely depending on the specific trade and geographic location.