For anyone who prepares Sacred Chrism Oils in a very old church such as mine, you may find the Latin abbreviations on the vessels instead of the English ones! Here they are, just for reference in case it helps anyone:

• Oil of Catechumens (OS): Oleum Sanctorum
• Oil of the Sick (OI): Oleum Infirmorum
• Sacred Chrism (SC): Sacrum Chrisma

At the big church in town, which is much more contemporary, I noticed that they have the English abbreviations on their vessels, which are:

• Oil of Catechumens (OC)
• Oil of the Sick (OS)
• Sacred Chrism (SC)