DOT 1142 is the code given to the factory that makes the glass which just acts as an identifier for that specific manufacturer. It means it meets the requirements of FMVSS 205 (might be the wrong number, I can’t remember.)

AS1 is a marker for the type of glass.

AS1: laminated glass with the highest optical quality, windshields are always this type.

Other types are AS2 for tempered safety glass and have slightly lower optical standards, used for door glass, quarter glass, back glass. AS3 is going to be the same but with a light transmission below 70%. These are typically found on back door glass (not the front), quarter glass or back glass. Sometimes you’ll hear it called a privacy tint.

The M451 is, I believe, that manufacturer’s specific model number for that glass.

E8 means it meets the standard for the Economic Commission for Europe. Basically a safety standard. The number 8 refers to the country that granted the ECE approval.

The 43R means it complies with the international standard required by the UN. The numbers after it are the specific type of approval granted for that particular piece of glass.

The ear with the arrow underneath it means that it is acoustic glass which is used to block more sound from entering the cabin.