The list here below is the abreviations and common terms that are widely used all over the world today, when one is grading postcards.

M:	A cards thats in mint in condition, is absolutely perfect or flawless.
NM:	Near Mint, in condition, if any, only a very, very light aging.
EX:	Like mint in appearance with no bends or creases. Basically a clean fresh card.
VG:	Corners may be rounded. Any creases are almost undetectible and does not detract from the appearance of the card.
G:	Good, with corners that may be blunt or rounded with bends and/or creases on the card.
FR:	Fair, with creases and bends more pronounced, corners more rounded, with a probability of some sort of soiling.
PR:	Very poor with excessive soiling, or stained, and/or heavy creases.

The continental size for a postcard is 4 x 6" (inch) or 15 x 10.5cm.

The standard or regular size in postcards is a postcard that is 3½ x 5½" (inch) or 9 x 14cm  These postcards are not modern, as they are usually old.

An over sized postcard is any postcard that is larger than the continental size. A vast majority of the over sized postcards are 5 x 7" (inches). As these cards are a lot larger than all the others, the view is clearly more detailed.

The size of a modern postcard is 6½ x 4¾" (inches).

The over sized postcards are very popular with tourists, but not with a lot of postcard collectors, this is mainly because of their size. They are usually a lot harder to forward on to someone else, unless you know of someone who has a specific need for them. So if you get stuck with any just do as I do, and write a small letter or note or even a "hello, I'm thinking of you", on them and send them off to a friend or relative that doesn't collect postcards, but would appreciate the thought and the words received from you!