[a|b] is a redstone input function for signs, where text replacing 'a' will be shown when the sign is powered, otherwise 'b' is shown. Type [light], and it will show you the current light level of the sign's position. [biome], [temp], [humid] each tell you the biome you're in, the temperature of that area, and the humidity of that area, respectively. [temp], [humid] will no longer function in Nether. [chunk] will tell you where to find the chunk file for this chunk.
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