**Challenge idea taken from:** [Eliseo D'Annunzio](https://codegolf.stackexchange.com/questions/230111/can-you-give-me-half-no-digits)
# Task
Provide code that evaluates to 0.5 numerically, i.e. the output must be recognized by your chosen language as a numeric value (Number, float, double, etc), not as a string.
The catch, the characters 0 through to 9 cannot be used.
One example that fits the brief would be the following:
`((++[[]][[~~""]]<<++[[]][[~~""]]))**((--[[]][[~~""]]))` which works out to 0.5 in JavaScript.
# Scoring
This is a code challenge, where scoring is done in terms of number of unique characters used in the submission. Ties are broken by lowest bytecount.
