This is a bi-color (green/red, orange when both colors are used) rectangular LED. Middle lead is negative, the longer of the two outer leads is for red, the other outer lead is for green.
This is a surplus product. It was obtained from a surplus store, from an inventory or from any other secondary source. You can expect this product to be in good working condition, but it can show signs of being handled, shipped, repackaged etc. The supply of a surplus article can suddenly run out, or the price can change. Get it while it is available.