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Bit Position Indicator
From SnesLab
The Bit Position Indicator is the period. This generally appears in "Flag Affected" fields of bit-breakdown diagrams, meaning that that specific bit is unaffected. It is a placeholder meant to take up space, and is distinct from a question mark or space character, which in reverse engineering indicate "don't know what happens to this bit."
Reference
- Appendix C-1 of Book I of the official Super Nintendo development manual