My question refers to a notation in following excerpt: https://stacks.math.columbia.edu/tag/0DW6
What is $A[0]$?
The complex whose 0th term is the ring $A$, and all of whose other terms are $0$, with $0$ maps everywhere.
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The complex whose 0th term is the ring $A$, and all of whose other terms are $0$, with $0$ maps everywhere.