wiki
This article is incomplete and waiting on someone to expand it.

Sliderhead

Sliderheads or sliderstarts are the starting points of all sliders found in osu! beatmaps. Once a sliderhead has been clicked the player has to follow along the sliderbody with their cursor, until the slidertail is reached and they can release their button. The colour of sliderheads is determined by the combo colours used by the mappers of a beatmap.