I would propose that ALPHA "codes" are not so much "jargon" as useful standardized abbreviations which makes recording in the field much quicker (and required for data when doing field work). Not a lot different than writing NC for North Carolina.
I certainly agree that the full species name is what should be used for general communication, I would encourage anyone doing a lot of birding to check out the ALPHA codes for their usefulness in the field.
In addition to the links provided earlier, you can look up species by entering ALPHA code, or find the ALPHA code by entering all or part of the common name at
Stella