The Bisicle is a consumable item sold by the Snowdin Shopkeeper for 15G, with more GOLD added for each boss battled. It is a unique item, as upon use, it leaves another item called a Unisicle that also heals 11 HP, giving the effect of being consumed twice.
Unisicle[]
A Unisicle is an item obtained by consuming a Bisicle. While in Serious Mode, despite being called "Popsicle," the game refers to it as "Unisicle" when consumed.