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Airport - Precision Approach Path Indicator (PAPI) v2

A precision approach path indicator (PAPI) consists of four sets of lights in a line perpendicular to the runway, usually mounted to the left side of the runway. [Wikipedia]

White (W) and red (R) lights indicate the pilot how far off the glide slope the aircraft is.

A mnemonic to remember the colors and their meaning is:
WWWW - White over White, you're high as a kite. / you'll fly all night
WWRR - Red over White, you're alright.
WRRR - White over Red, unsaid / you're under head
RRRR - Red over Red, you're dead.

Can be found under the airport category and is freely placeable!