A Permission To Approach (or PTA) was a Culture communications signal represented in standard nonary Marain. A PTA was used to request closer contact in socially-awkward[1] or security-sensitive situations.[2]

The signal was many millennia old by the 24th century CE by which time it was rarely used, having been made redundant by the technology that created the neural lace.[1]


  1. 1.0 1.1 Matter, chapter 20
  2. Excession, chapter 8.2

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