Find a variable without knowing its name!
Perform an interactive reverse variable lookups for Emacs Lisp using Helm.
Once the helm entry is selected, the variable is opened in either
describe-variable, or helpful-variable, if it’s installed.
helm-atoms Open the helm-atoms interface
helm-atoms-search-sequences
Search atoms bound to sequences (lists, vectors) if non-nil.
More thorough search, but worse performance.