minus green

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From http://www.gamonline.com/catalog/cinefilters/app.php :

MINUS GREEN (FLUORESCENT AND HMI CORRECTION)
Minus green filters are designed to reduce the green spike found in fluorescent and HMI light sources. Minus green filters can be combined with the CTO or CTB filters to simulate the desired color temperature. GamColor ND and combination ND/CTO filters.
GamColor Minus green filters are available in six steps to deal with the many types of fluorescent lamps and the fact that the green peak increases with the age of an HMI lamp. You can choose from 1/8 Minus green through full Minus green. The six steps include 1/8, 1/4, 1/2, 3/4, minus green and extra minus green. Where color reproduction is critical use your color meter to determine the GamColor Minus green filter required and refer to the convenient GamColor correction chart.

Equivalents in other brands:
L247 LEE Minus Green
L248 Half Minus Green
L249 Quarter Minus Green
L279 Eighth Minus Green
R3318 Tough 1/8 Minus Green
R3314 Tough 1/4 Minus Green
R3313 Tough 1/2 Minus Green
R3308 Tough Minus Green

See also plus green.