Term: Half-Proficiency

ΒΌ your character level, rounded up. Every 4 levels, this number will go up by 1.
  The table below will help identify and add Half-Proficiency, if it is needed.
 
Character / Threat Level Half-proficency
1-4 +1
5-8 +2
9-12 +3
13-16 +4
17-20 +5
20+ +6

  The full page on Proficiency Bonuses can be found here.

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