apply_filters( 'ngettext', string $translation, string $single, string $plural, string $number, string $domain )

Parameters

$translation

(string) Translated text.

$single

(string) The text to be used if the number is singular.

$plural

(string) The text to be used if the number is plural.

$number

(string) The number to compare against to use either the singular or plural form.

$domain

(string) Text domain. Unique identifier for retrieving translated strings.