(m) means that a noun is masculine. French nouns have a gender, which is either feminine (like la dame or la lune) or masculine (like l'homme or le soleil).
(M)
Luca carried two skis toward the snowy mountain.Luca portait deux skis en direction de la montagne enneigée.
An intransitive verb is one that does not require a direct object (e.g., éternuer.).