There are three oils used in the sacraments of Baptism, Confirmation, Ordination and Sacrament of the sick. All three oils are blessed at the Chrism Mass by the Bishop and then each priest collects some to use during the following year.
The image below shows letters on each bottle, these represent Latin words.
OC = oleum catechumenorum is used for adult catechumens and infants.
OI = oleum infirmorum is used for anointing the sick of the parish, this may be before or after an operation or when someone is seriously ill.
SC = sacrum chrisma is used by the clergy for baptism, confirmation, the ordination of priests and bishops or in the consecration of altars.
These same letters are engraved on the top of the oils in the Cathedral.
The image below shows letters on each bottle, these represent Latin words.
OC = oleum catechumenorum is used for adult catechumens and infants.
OI = oleum infirmorum is used for anointing the sick of the parish, this may be before or after an operation or when someone is seriously ill.
SC = sacrum chrisma is used by the clergy for baptism, confirmation, the ordination of priests and bishops or in the consecration of altars.
These same letters are engraved on the top of the oils in the Cathedral.

