Looks like the "right angle" cutter is the Kaijirushi KHS Butter Knife

https://www.amazon.co.jp/-/en/FA-5162-Kaijirushi-KHS-Butter-...

I like the associated butter tub (frequently bought together section), what are the imperial butter sizes for it at my local American grocery store...?

  # goal.rb
  module G
    def [](o=nil)
      o ? "g#{values[0].to_s}al" : ({ :n => values[0].to_s + "o" }.extend G)
    end
  end

  g = {}.extend G
  
  eval DATA.read.gsub("(", "[").gsub(")", "]")
  

__END__

  gal = g('al')
  p gal
  
  goal = g()('al')
  p goal

  goooooooal = g()()()()()()()('al')
  p goooooooal
  
  # ruby goal.rb
  # "gal"
  # "goal"
  # "goooooooal"

# https://gist.github.com/morganhankins/de13ee378907143a7789