An anti-glider is the black/white reversal of a glider (in an appropriate rule).
The following is an example of an anti-glider and a glider in B3-ckqr4k5c6ckn7/S2aei3-ekqy4-acekz5-aijn6-kn78:
x = 22, y = 17, rule = B3-ckqr4k5c6ckn7/S2aei3-ekqy4-acekz5-aijn6-kn78
2o2bo2bo2bo2bo2bo$b16o$b15o$16o$b16o$b15o$16o$b6o2b8o2b2o$b7o2b6o4b2o$
7ob8o3bo$b16o$b15o$16o$b16o$b15o$16o$o2bo2bo2bo2bo2b2o!
#C [[ THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ THEME 6 GRID GRIDMAJOR 0 GPS 4 STOP 16 THUMBLAUNCH THUMBSIZE 2 ]]
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