This is the 3808th most frequent French word.
vtt
"VTT" stands for "vélo tout terrain" and means "mountain bike" in English.
Here, 'vtt' is understood as 'vélo tout terrain', which means 'mountain bike' or 'mountain biking' and refers to the activity.
Je fais souvent du vélo tout terrain dans les montagnes.
I often go mountain biking in the mountains.
In this sentence, 'VTT' specifies the physical object of a mountain bike as opposed to the activity.
Mon ami possède un VTT de dernière génération.
My friend owns a latest-generation mountain bike.
Here, 'VTT' refers to a sport event related to mountain biking, indicating the context of competitive cycling activities.