__($key, $domain = ‘core’) – Translate strings

_e($key, $domain = ‘core’) – Translate strings (echo them)

_m($key) – Translate string (flash messages)

_n($single_key, $plural_key, $count, $domain = ‘core’) – Retrieve the singular or plural translation of the string.

_mn($single_key, $plural_key, $count) – Retrieve the singular or plural translation