Acetate: An acetate disc (also known as a test acetate, lacquer, or transcription disc) is a type of gramophone record that is recorded directly from an audio source. Although acetates can be made from any audio source, they are typically produced from a master tape recording for testing the quality of the tape-to-disc transcription. A typical acetate disc is an aluminum disc, 10 or 12 inches in diameter, that is covered with a thin coating of nitrocellulose lacquer in which the sound groove is cut. Discs of this type can be played on any normal phonograph. Some acetates are highly prized for their rarity
b/w: side B
Coloured Sleeve: it's a sleeve, usually with the same picture of the classical sleeve, but with another colour. Tipically from Korea
Custom ps: it's a picture sleeve made only for that album by the local producers
Embossed: Embossing is the process of creating a three-dimensional image or design in paper and other ductile materials. It is typically accomplished with a combination of heat and pressure on the paper
Etched: tipically it's a 12" with one side recorded and another side empty, or unregistered (typically in the second side you can find the signatures, for example The Show Must Go On)
No Ps: an album realeased without a picture sleeve or with a generic sleeve (tipical for 7")
OBI: is traditionally a strip of paper looped around the left side or folded over the top of Japanese LP albums
Paper Sleeve: A paper disc sized envelope with a circular clear window on the front
Testpressing: It's an album made only for test, before its final release
Unique ps: it's an official picture sleeve created only for one single release
w/I: A simple translation is enough, with insert
SP: SP stands for SPeciality Records based in Pennsylvania which is on the East coast of America near New York.
AR: AR stands for Allied Record Company based on the West coast of America near Los Angeles.