The group CH2=CHCH2- is called allyl. Some compounds that derive from the allyl group are:

allyl system 01
[1] Allyl bromide
[2] Allyl alcohol
[3] Allyl chloride
The term allylic position is also used to designate the neighboring position of a double bond. Hydrogens located in that position are called allylic hydrogens ( H ).
allyl system 02
The carbons located in the allylic position are called allylic carbons (*).
Carbocations, carbanions and radicals formed in allylic positions are stabilized by delocalizing the charge by resonance.
allyl system 03
[4] Allyl cation
[5] Allyl anion
[6] Allyl radical