module Ransack::Configuration

end
}
default_arrow: 'U+11047'
down_arrow: 'U+02193',
up_arrow: '',
config.custom_arrows = {
# Globally set the up arrow to an icon, and the down and default arrows to unicode.
Ransack.configure do |config|

like `config/initializers/ransack.rb` as follows:
Any of the defaults may be globally overridden in an initializer file

By default this is nil so nothing will be displayed.
There is also a default arrow which is displayed if a column is not sorted.

down_arrow: '▲'
up_arrow: '▼'

By default, Ransack displays sort order indicator arrows with HTML codes:

def custom_arrows=(opts = {})
  self.options[:up_arrow] = opts[:up_arrow].freeze if opts[:up_arrow]
  self.options[:down_arrow] = opts[:down_arrow].freeze if opts[:down_arrow]
  self.options[:default_arrow] = opts[:default_arrow].freeze if opts[:default_arrow]
end