Context in translation

Prototype:

_x( string $text, string $context, string $domain = 'default' ): string

Quite a few times, there will be collisions with similar translatable text found in more than two places, but with different translated context.

By including the context in the pot file, translators can translate the two strings differently.

Example:

_x( 'T', 'Tuesday', 'text-domain');
_x( 'T', 'Thursday', 'text-domain');

source : https://developer.wordpress.org/reference/functions/_x/